Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3cf3b3e5a5a9d4…

MALICIOUS

PDF

104.6 KB Created: 2021-03-03 15:05:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 76aed08796cb9fa637d833d31bbe672f SHA-1: a00409b73ea5159f5a93e36bedaf0aa03c0097a1 SHA-256: dd3cf3b3e5a5a9d47fdcff51b79a426eeb2ddec1b2cd66c0e30cc3270e4ea28f
192 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the ML classifier strongly flagged this PDF as malicious. The presence of a 'download button' heuristic suggests a lure to download further malicious content, likely exploiting a client vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=lenovo+thinkpad+t430+bluetooth+driver+windows+7 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4384819/normal_5fe1d93072fba.pdfIn PDF document text
    • http://kprovk.xyz/verb_worksheets_3rd_gradeow15g.pdfIn PDF document text
    • http://wamikesaximilub.22web.org/proofs_involving_congruent_triangles_answer_key_2010.pdfIn PDF document text
    • http://hhizmet.com/high_iron_foods_list_for_anemiam16kq.pdfIn PDF document text
    • http://myluckybet.xyz/rixira8uju4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444351/normal_5feda5d9473e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405184/normal_60236d2bb6296.pdfIn PDF document text
    • http://summer-italy.fun/regogesikiwojoxoma56ufn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lulovijolezon.epizy.com/cake_photo_happy_birthday.pdfIn PDF document text
    • http://vosivoru.epizy.com/98825998984.pdfIn PDF document text
    • http://fikikozazilut.rf.gd/string_format_integer_3_digits.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/bars_and_melody_fast_car_song.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/casio_g-shock_g-9000-1ver.pdfIn PDF document text
    • http://runumap.rf.gd/58654652459.pdfIn PDF document text
    • http://perimomu.epizy.com/austin_kleon_keep_going.pdfIn PDF document text
    • http://wonenuw.epizy.com/transunion_consumer_credit_report_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/usb_bluetooth_dongle_e-_ubtv_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/46802708897.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_off00015343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15343 5816 bytes
SHA-256: 09ce8e5ee12daa79979d0f5c9e178d9024e84f00b2cc6159668175c5a7ce47cc
font_01_sfnt_off0001672a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1672A 14744 bytes
SHA-256: 624da8f0269d25c95e5eeb7e23c1cff6fb993c4433265761ee6501bb983abb31

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