Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eab7d60e822cd7d…

MALICIOUS

PDF

103.5 KB Created: 2021-03-31 21:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ab672656b0978f8064291a7a19043f1d SHA-1: cbcd4f7b656187a5123c983708481131741463d1 SHA-256: 2eab7d60e822cd7d55215036d592101e180e607b235779360c3ecb3863f61014
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links to known malicious redirector infrastructure, specifically `https://yafferge.ru/award?keyword=entresto+patient+assistance+form+pdf`. Heuristics indicate this is a malicious redirector and a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to contain keywords related to the lure. The presence of multiple suspicious URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/award?keyword=entresto+patient+assistance+form+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4476766/normal_60159f868b7a6.pdfIn PDF document text
    • http://characduwe.space/kenagabulewusorululub1cb83.pdfIn PDF document text
    • https://kubikogemovi.weebly.com/uploads/1/3/4/0/134095998/lebokuf.pdfIn PDF document text
    • https://zemotererozo.weebly.com/uploads/1/3/0/7/130738962/pulogelupavukunam.pdfIn PDF document text
    • http://goligofalu.medianewsonline.com/kivodavevinog.pdfIn PDF document text
    • http://torchqbfl.fun/farming_simulator_pc_game_highly_compressedped1g.pdfIn PDF document text
    • https://cdn.sqhk.co/samekikogeri/a5gjsia/the_smurfs_2_games.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/dipodemetekidegepox.pdfIn PDF document text
    • http://opensol.xyz/hp_1536dnf_printer_pricee5bxn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454547/normal_5fddcbdb2a6a3.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/c9jhagd/fastlane_road_to_revenge_hack_mod_apk_download.pdfIn PDF document text
    • https://zijoganidilo.weebly.com/uploads/1/3/1/8/131856317/73932c33.pdfIn PDF document text
    • http://lafilubepojev.scienceontheweb.net/mazawisitubufopinukuduf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426699/normal_60596b8284f7b.pdfIn PDF document text
    • http://vumamanepu.sportsontheweb.net/aflac_sickness_claim_form.pdfIn PDF document text
    • https://moganuvutixeku.weebly.com/uploads/1/3/1/1/131163890/f3ea6a4.pdfIn PDF document text
    • https://juwufugoxeza.weebly.com/uploads/1/3/4/5/134528381/b7d2df69.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/cgwjSic/67146384639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379722/normal_6011b87121eb9.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/2952Vjb/pesiroveb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387701/normal_60644b4630632.pdfIn PDF document text
    • http://idslim-italia.site/influence_and_persuasion_skillszpedm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bugenerefajujus.atwebpages.com/gibbons_and_chakraborty_nonparametric_statistical_inference.pdfIn PDF document text
    • http://levapoloj.onlinewebshop.net/40055437384.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F55 5016 bytes
SHA-256: 9aa30fdce8264e5552bc9b123ea6c33d3f27ddb7cc09acef61c2bd59602eb9ae
font_01_sfnt_off00014047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14047 12352 bytes
SHA-256: e79ed7484e88335cdf2a60e2c7d8ed2d94533b73c0a13cec0b8fe18002431de2
font_02_sfnt_off00016a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A85 16312 bytes
SHA-256: 4dd54476baea8e95977730749914ee2a5f1a6ccb58adbad06d5dc92bdd54ca55
font_03_sfnt_off0001803a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1803A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3