Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce7853b36af89c2…

MALICIOUS

PDF

82.3 KB Created: 2021-03-15 00:54:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 78d5b985baeaf3562d11fc214e7ab9bd SHA-1: d0464b9a1a67bc194c3cbc4c8dd185e641979f6b SHA-256: 3ce7853b36af89c27e30db2048d8004f5a8adc9bcecd49bb348563cfdc48b661
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://mezovuduw.ru/strik?utm_term=how+do+i+get+my+steps+back+on+my+garmin+app PDF link annotation
    • http://tonedomopoja.scienceontheweb.net/how_to_tell_if_diesel_fuel_pump_is_bad.pdfIn PDF document text
    • http://qunit.space/boxepubomozawuxikanek7cmmw.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/46409475186.pdfIn PDF document text
    • http://tryse.xyz/lefamewesukubozujofujeswbf0m.pdfIn PDF document text
    • https://kobivepetere.weebly.com/uploads/1/3/1/8/131871499/592576.pdfIn PDF document text
    • https://mubuxepuvu.weebly.com/uploads/1/3/1/3/131383429/gulalikupunow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403819/normal_5fcd44db6aec2.pdfIn PDF document text
    • http://yatvoyya.fun/86608023267ow69h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448986/normal_5fc665602576d.pdfIn PDF document text
    • https://wajovojov.weebly.com/uploads/1/3/4/6/134652085/9624773.pdfIn PDF document text
    • https://lajanasana.weebly.com/uploads/1/3/4/3/134368101/6982594.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369776/normal_5feec6ebe87dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496853/normal_5feb96ae66120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410447/normal_60165096a0af1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_036442a8cc72418890b67800f797a0d8.pdf?index=trueIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_d3b364d901374faab20dea27e367d0b5.pdf?index=trueIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_4e8903be48094d018d386795b6a79b8d.pdf?index=trueIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_c1537374afd14bcf80a091bf3bbbe892.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_1858ab4eeb0f4f7dafe1b360b8a243e7.pdf?index=trueIn 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_off000102f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 5720 bytes
SHA-256: ccb2757ba3ae2186b4ce74dd205351e4be0fbc7d6543988c311f0eff74042fb1
font_01_sfnt_off0001166f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166F 10920 bytes
SHA-256: 9fd9fdc884fcf1fc6ab5f523ec49e98849747d8143e08bb3be0fa22d9202737d

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