Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f0af4e6482503f…

MALICIOUS

PDF

68.7 KB Created: 2021-03-28 17:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f63c931d04a1697e1f8a2f25d7e3630e SHA-1: b101f92d704b32974db7f755ca3fcc33ee9a3ab1 SHA-256: 52f0af4e6482503fdb6f4e29e5b9bf40f4d49c13e7e6d5bc9c7f49ef2e57cd25
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, with the primary one being `https://druttle.ru/wix?keyword=81.402+in+expanded+form+using+powers+of+10`. The heuristic `PDF_SEO_LINK_FARM` indicates the presence of numerous links, suggesting a tactic to manipulate search engine results or direct users to potentially harmful sites. No scripts were extracted from this sample.

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://druttle.ru/wix?keyword=81.402+in+expanded+form+using+powers+of+10
    • https://cdn.sqhk.co/vatomepipiw/NUgiXhd/animus_harbinger_nintendo_switch.pdf
    • https://cdn-cms.f-static.net/uploads/4390095/normal_6037f51475397.pdf
    • https://jijiwunidagaba.weebly.com/uploads/1/3/5/9/135964504/rexol.pdf
    • https://cdn.sqhk.co/vapitinab/0heMrij/marco_s_pizza_near_me_telephone_number.pdf
    • https://cdn.sqhk.co/mujekesire/YWiiid6/wisiwolilofoxatake.pdf
    • https://vijudapakov.weebly.com/uploads/1/3/4/6/134677764/jezojuzeza-wusosirelaluwe.pdf
    • https://cdn-cms.f-static.net/uploads/4473637/normal_6040b1e4a8dc3.pdf
    • https://static.s123-cdn-static.com/uploads/4475571/normal_5ff75e69e7b94.pdf
    • https://wekexodaxax.weebly.com/uploads/1/3/4/7/134713384/dawem_zasilu_votugababak.pdf
    • https://pirikanupixiro.weebly.com/uploads/1/3/0/8/130873781/podudazevaw.pdf
    • https://xafixefar.weebly.com/uploads/1/3/4/7/134714422/ed85fc6ea9f6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e6921e10-55a0-4a15-bb39-d80d8220db2b/how_do_you_achieve_your_goals_and_objectives_answer.pdf
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_61873d21c2c445d9b5c94300cde3cf5a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/07a73f62-088f-41f3-92a2-d4bfbf2e3e15/what_is_a_quantum_number_in_chemistry.pdf
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_42863091773040ad823296ec937117d5.pdf?index=true
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_956c5257923f439480969d6bc4290ba5.pdf?index=true
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_0b359220a8594755a8f8cb0a2ff05c73.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd07.bin
d81f32aa6f0f42aaebafb7e78c624e9df799185781f75559faf405b634594a26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 6032 bytes
font_01_sfnt_off0000e1a9.bin
9fde8fe55a5e77b3246c35f7ba5bd160897d1010eb85afff01dadb689bb75ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A9 10556 bytes

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