Malicious PDF — malware analysis report

Static analysis result for SHA-256 6253f68bebe8f8cc…

MALICIOUS

PDF

78.0 KB Created: 2021-06-02 09:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7b30f8a4c4266f6eb2fe23aa8228253 SHA-1: 9a072e2cb3e251ef811f78704f0f7a6c1068ee5a SHA-256: 6253f68bebe8f8ccbb360ea2f02c560f8a10c4583cb2db38e83040e3aacf08b3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The document body, though heavily obfuscated, suggests a lure related to 'high blood pressure guidelines'. The presence of multiple unknown URLs, including one pointing to a potential phishing domain (philabc.ru) and another to a Weebly-hosted PDF, indicates a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/pbw?utm_term=what+are+the+new+guidelines+for+high+blood+pressure
    • https://sefovajeve.weebly.com/uploads/1/3/0/7/130775607/pixuzifenakiviwumex.pdf
    • https://koxarakofawel.weebly.com/uploads/1/3/4/3/134310925/3159744.pdf
    • https://cdn-cms.f-static.net/uploads/4477401/normal_60273e2380225.pdf
    • https://cdn-cms.f-static.net/uploads/4470968/normal_6022b9db1b245.pdf
    • https://degufulu.weebly.com/uploads/1/3/1/3/131379990/1523714.pdf
    • https://xeninudi.weebly.com/uploads/1/3/3/9/133997188/64d4d301f1c22.pdf
    • https://cdn-cms.f-static.net/uploads/4478133/normal_601b8a5b69d66.pdf
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/xajugibemurimetot.pdf
    • https://static.s123-cdn-static.com/uploads/4422373/normal_5ffd9b1f340b3.pdf
    • https://kaseloguxov.weebly.com/uploads/1/3/1/4/131406527/8401685.pdf
    • https://gatevipamor.weebly.com/uploads/1/3/4/8/134878843/zukeku_dugijot.pdf
    • https://xubawiki.weebly.com/uploads/1/3/1/1/131163512/fopewiberubedekilil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1df64d4e-7fe6-4b6b-b0d8-9fc110d28de7/moto_g_3rd_generation_price_2gb_ram.pdf
    • https://uploads.strikinglycdn.com/files/2753e679-7567-4342-b79b-cfac87499d7c/introduction_to_management_information_system_abac.pdf
    • https://uploads.strikinglycdn.com/files/375d4e8d-a002-4d88-aae1-74d07712ef76/61793094223.pdf
    • https://uploads.strikinglycdn.com/files/e446e26b-dbd4-4241-98f5-526fd0cabd8c/54840281798.pdf
    • https://uploads.strikinglycdn.com/files/083337be-352f-4a7f-8ec5-cba5e6e50d4a/sexaver.pdf
    • https://uploads.strikinglycdn.com/files/7c7429bc-a4b4-4ed3-860e-bb8564358161/61825657375.pdf
    • https://uploads.strikinglycdn.com/files/119507f6-9251-439e-a8e1-047cb7abd6bc/pakelonepenojaregalo.pdf
    • https://uploads.strikinglycdn.com/files/cd9a81c9-a48c-4104-9f15-c87d7a4a0bac/what_is_the_best_ending_in_dark_souls_3.pdf
    • https://uploads.strikinglycdn.com/files/2c0dc0ad-3f2c-40c1-877f-11a8a5082328/costumbres_de_los_punks.pdf
    • https://uploads.strikinglycdn.com/files/64f82f0f-43c2-4f78-adac-695c7c10fc91/xejasurolavu.pdf
    • https://uploads.strikinglycdn.com/files/f9413081-2de7-4cb5-b410-337f3bc87b77/dutofinuzefijigewolibon.pdf
    • https://uploads.strikinglycdn.com/files/3377d63f-eab7-41df-a87c-aa99a0022bde/migelot.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2bc.bin
efe7a05d867f4f4450c8343b501235645f1b096f09ba0f9314c565c7f626c47c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 5548 bytes
font_01_sfnt_off000105a9.bin
580c7fba7ba0b5657751e16f21bbf76a5ac04ed6fea9699e291da8f93ccd8f30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A9 10500 bytes

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