Malicious PDF — malware analysis report

Static analysis result for SHA-256 d185f04317bfd444…

MALICIOUS

PDF

82.1 KB Created: 2021-03-24 11:02:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b938f72e1506ea6f9cb8e8fe6d1981e6 SHA-1: bd0a59982e0b9d842daeff1aab9b3274aa83dca6 SHA-256: d185f04317bfd444e86e818358b5d45143c02fb1bf7f872a231246588da6f3fd
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and a callback phishing lure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of numerous external URIs points towards an attempt to redirect the user to malicious sites. The SE_CALLBACK_LURE heuristic specifically identifies the pattern of a document asking the user to call a phone number in a context of urgency or dispute.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pelibifir.ru/strik?utm_term=2002+ford+explorer+xlt+4wd+specs PDF link annotation
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/gotimuwojuxer_xamexenerafejeg_rudijosakixu_jojaregi.pdfIn PDF document text
    • https://buzumuramatetaw.weebly.com/uploads/1/3/2/6/132681877/numetugex_biwuxowedoditu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_602abcf99cc4b.pdfIn PDF document text
    • http://vinuporabomod.iblogger.org/sat_reading_tips_prepscholar.pdfIn PDF document text
    • http://bamejudodenor.iblogger.org/devuvep.pdfIn PDF document text
    • https://sopunarexij.weebly.com/uploads/1/3/1/8/131857112/niroje_dukel_furofobu.pdfIn PDF document text
    • http://guronid.mygamesonline.org/antimicrobial_properties_of_garlic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446496/normal_601b6d294c4a0.pdfIn PDF document text
    • https://duresanu.weebly.com/uploads/1/3/5/3/135334900/8224940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449405/normal_6059c87f04db7.pdfIn PDF document text
    • http://xufuxenu.mypressonline.com/elizabeth_wurtzel_prozac_nation.pdfIn PDF document text
    • https://webapifupa.weebly.com/uploads/1/3/4/7/134706955/bf7b63e0f5.pdfIn PDF document text
    • http://segaruzobuguses.scienceontheweb.net/what_are_some_aggressive_behaviors.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479679/normal_6031db5aa7c9c.pdfIn PDF document text
    • https://dotuxebi.weebly.com/uploads/1/3/1/4/131454754/03d8d32f013168.pdfIn PDF document text
    • https://viforiler.weebly.com/uploads/1/3/0/8/130874197/2262382.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/581e1088-d69e-41e3-92c7-52261cbb389b/wordpress_login_admin_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dce10277-5906-4dea-b5f0-4ced9802c3de/mabowumukiwasusemededivow.pdfIn PDF document text
    • http://memamawu.onlinewebshop.net/bossuet_sermon_sur_la_mort.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f498bff-c2c1-4099-baaf-2485d655ea03/what_does_encoding_failure_document_readable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fc83b44-da97-422e-a770-2bd0d2593c6d/is_a_nightmare_before_christmas_a_christmas_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d93a239-5031-4c7c-a406-7c88b05e5310/nodetirelalem.pdfIn PDF document text
    • http://wunekoxewufomaf.epizy.com/gakomumafatodekuma.pdfIn PDF document text
    • http://taxisariwoboduz.epizy.com/96532198952.pdfIn PDF document text
    • http://mixezized.myartsonline.com/ramayana_story_in_english_free_download.pdfIn PDF document text
    • http://wuzorijo.rf.gd/dulenadipugimakazuw.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001045c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045C 5364 bytes
SHA-256: eda6c53c2fb446e9172b1394a9cacabe66d817fdb6d8e7a61739985c84d07cfe
font_01_sfnt_off000116d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D6 10512 bytes
SHA-256: 23b020a50805444f0b802fa6fe8acc02b962a1d35632726955fec0ef6dbbae60