Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8b39cb718b7c97…

MALICIOUS

PDF

70.3 KB Created: 2021-02-12 17:01:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5a34c6b7d8014e5fa02d6b1d6f401716 SHA-1: 84bc2341433e93184dcf4525f6c2ef201949c143 SHA-256: fa8b39cb718b7c9767689ab835e0f243497da1b7a955ec4c25b940ae231879ad
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to educational materials, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://crophysi.ru/wix?keyword=usmle+road+map+gross+anatomy+2nd+edition+pdf In PDF document text
    • https://cdn.sqhk.co/kososojog/jxjfjax/tulinewelufa.pdfIn PDF document text
    • http://datinge.site/hollywood_movies_hdpopcorns3vlqe.pdfIn PDF document text
    • https://pidoruna.weebly.com/uploads/1/3/5/9/135966994/9380477.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465690/normal_5fe5fe254eb97.pdfIn PDF document text
    • http://feedbacrnz.space/novunovududawilawamilwionb.pdfIn PDF document text
    • http://hookup154.online/satebefne99k.pdfIn PDF document text
    • https://cdn.sqhk.co/nipumusawobo/8jaqBwA/mexur.pdfIn PDF document text
    • http://cheapestshop.xyz/71375799101ok7p8.pdfIn PDF document text
    • http://emirofficialzm.com/brandon_woelfel_book7ahcr.pdfIn PDF document text
    • http://fishland.store/kiplinger_retirement_report_change_of_addressjm7j7.pdfIn PDF document text
    • http://beremoter.online/xusokiseorvw3.pdfIn PDF document text
    • http://allwoman.site/bates_numbering_free5q86v.pdfIn PDF document text
    • http://retys.fun/space_marshals_2_how_to_get_100cjisu.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/6413453.pdfIn PDF document text
    • http://copyrightreports.com/42498447026nfrjq.pdfIn PDF document text
    • http://axecheat8.xyz/filling_screw_holes_in_wood_furniturez70yg.pdfIn PDF document text
    • http://vnds-v.website/awana_sparks_curriculumxj2j6.pdfIn PDF document text
    • http://abzac.me/valiwutgz1jw.pdfIn PDF document text
    • https://gagodizuw.weebly.com/uploads/1/3/5/9/135965264/vazenisodo_mumefomafugilem_futax.pdfIn PDF document text
    • http://healthytrands.com/91976860314l9d12.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzixamover/hgchevd/can_you_escape_2_level_22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD425 5584 bytes
SHA-256: 0b1118abf31f501c3f1fa6b7422c8894cb7260df8b9f480777f3d9505d11a16c
font_01_sfnt_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 10756 bytes
SHA-256: 9b05f8587d3b35291dae71668ba749bfee33cf76521cb1df8cdc13b0909bb4d2

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