Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1579e870f37aa9…

MALICIOUS

PDF

76.0 KB Created: 2021-04-05 03:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc78b1b68600b3c44efd38817b3680b9 SHA-1: 30b73259f60806e0923b9e29bc208ee64bb48174 SHA-256: 6d1579e870f37aa90cff7ad97eaf063c54b4408d7dc9947178d2058067202f99
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm designed to direct users to other sites. One prominent URL, 'https://soxebez.ru/wix?keyword=smart+cycle+instruction+manual', is embedded within the document's text, suggesting a lure to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/wix?keyword=smart+cycle+instruction+manual
    • https://cdn-cms.f-static.net/uploads/4392470/normal_60399ecb799a3.pdf
    • https://static.s123-cdn-static.com/uploads/4384307/normal_5ff39da97e0f3.pdf
    • https://cdn.sqhk.co/tizuvuwo/jtjgg86/xemitapu.pdf
    • https://static.s123-cdn-static.com/uploads/4445331/normal_5fddd9f95d388.pdf
    • https://cdn-cms.f-static.net/uploads/4428335/normal_6015815c0195c.pdf
    • https://cdn-cms.f-static.net/uploads/4460677/normal_600b352377f14.pdf
    • https://cdn.sqhk.co/libibajuzumu/6WicYzG/rabibatadorubabigisawuze.pdf
    • https://cdn-cms.f-static.net/uploads/4418783/normal_5fd2c4e2c83ba.pdf
    • https://static.s123-cdn-static.com/uploads/4466154/normal_5fd0927ec5a47.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ae1aed89-1258-488d-9dfa-2e3cb41a4bc4/jujan.pdf
    • https://d74058ad-8c31-4576-aeb4-582a73b10e1e.filesusr.com/ugd/666c83_b3e8eaa914a949d094a249698adb1c09.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b067e1fc-871d-45ca-ae2f-59cc0bce7314/70138959904.pdf
    • https://uploads.strikinglycdn.com/files/7ef5f4ea-a9de-4586-9858-462c0beb63ee/how_long_does_it_take_to_charge_a_g_shock_solar_watch.pdf
    • https://uploads.strikinglycdn.com/files/3a1d96eb-571b-4a1f-8583-d4abf32b36a9/38684728472.pdf
    • https://uploads.strikinglycdn.com/files/ed702b03-6a22-4a13-a484-a96c9880a652/what_is_system_reliability_engineering.pdf
    • https://uploads.strikinglycdn.com/files/77fbe17b-c567-4ece-9b2c-05ffa7462bc3/wevejopodasugokizajisotir.pdf
    • https://uploads.strikinglycdn.com/files/f7d21774-3a20-4915-9213-e81e6e16455e/gewividaxidixelunubob.pdf
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_f2051dd8b77a423a89752f921c8c4023.pdf?index=true
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_db9958d1f8354301bb677cef4397521f.pdf?index=true
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_81a0268d2b944f07ade4f7b8b92f6dd1.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_off0000e8aa.bin
0a5e37d62e3b234123ee2f0507233784648c42af12e1cd20d54b35becd4e0984		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 5148 bytes
font_01_sfnt_off0000fa18.bin
75ee7d3ff3f1d6b40abfb96c5b04d2674e28163e3b3ca03c58ddbd178f062924		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 11820 bytes

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