Malicious PDF — malware analysis report

Static analysis result for SHA-256 c172429180ae54ee…

MALICIOUS

PDF

81.2 KB Created: 2021-04-01 06:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 974ba3c5538a0ec72afe11e7fe6f2a85 SHA-1: 4c30ce731664c3097a6901764e045c1a57e03be8 SHA-256: c172429180ae54ee998723cb0d645083429030145de5f74ef75a79485137c740
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The presence of a large number of external links, including a link farm, suggests an attempt to manipulate search engine results or redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristics suggest potential for embedded malicious JavaScript, commonly used in PDF exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=john+deere+1330se+owners+manual
    • http://wurigakisedepov.iblogger.org/megorawukawodedadakob.pdf
    • https://texanajak.weebly.com/uploads/1/3/4/0/134018539/waluwiwisupenurok.pdf
    • https://cdn-cms.f-static.net/uploads/4413867/normal_60197480a40fe.pdf
    • https://cdn-cms.f-static.net/uploads/4467027/normal_600c44d4632cc.pdf
    • https://cdn-cms.f-static.net/uploads/4413712/normal_5fd8f5aa57794.pdf
    • https://cdn-cms.f-static.net/uploads/4485176/normal_5fe7089dda328.pdf
    • https://sefokuto.weebly.com/uploads/1/3/0/7/130738721/gaxugug-memopexas-movizalijeluva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://dokubuxopid.rf.gd/bowofizunurovazifos.pdf
    • https://uploads.strikinglycdn.com/files/7dabd36b-0b77-4bdd-8743-b003ff7dc27b/mizibex.pdf
    • https://uploads.strikinglycdn.com/files/548cf47f-d0be-4e72-be7f-3e8c4753a420/how_to_reset_my_kenmore_microwave.pdf
    • https://uploads.strikinglycdn.com/files/057c851b-232a-42e7-afc1-c61e883a19b2/21111767307.pdf
    • https://uploads.strikinglycdn.com/files/09d98364-e2ac-4bf3-82aa-c6bf0d5d9759/honeywell_17000-s_air_purifier.pdf
    • https://uploads.strikinglycdn.com/files/0cfc11ac-4dc5-4039-9603-4c600c507745/velasaxaxopurolaxon.pdf
    • https://uploads.strikinglycdn.com/files/fef41cf0-4d64-4780-a478-0719dae46da4/what_does_woke_mean.pdf
    • https://uploads.strikinglycdn.com/files/b47ea93f-6551-44a2-80b0-18c415cdd982/hp_elitebook_8570w_manual.pdf
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_4c497f9f71b745a5ab164fa1e55bf1ab.pdf?index=true
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_c60817808e1241cd8931ab3f73b71135.pdf?index=true
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_e70b9d8395fb496692d5a8d39be0d79f.pdf?index=true
    • http://vukenorap.epizy.com/shaadi_mein_zaroor_aana_movie_2018.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f164.bin
ebc69f1e702c5a877b714f5577771db1c023e21cc52845b2c8eadd1df956544f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 5260 bytes
font_01_sfnt_off00010317.bin
a78d34d48f652ced87461fb7742de9e79876ba399ebf23f5f0eb229fb25284e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 11108 bytes
font_02_sfnt_off0001291b.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1291B 4324 bytes

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