Malicious PDF — malware analysis report

Static analysis result for SHA-256 71649c3b0c257f37…

MALICIOUS

PDF

76.0 KB Created: 2021-05-23 02:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfc4e019ba380cdf99c013e88b032148 SHA-1: bd3e096e9cc845b3295c5425af04a44257c03589 SHA-256: 71649c3b0c257f379f981a4407ebe1a1dcbe70e6d7c4a2671f14404ababac69e
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or SEO spamming tactic. One prominent URL, 'https://seumenha.ru/strik?utm_term=paranormal+activity+ghost+dimension+online+stream', appears to be a lure for potentially malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document may be designed to trick users into providing a password for an archive, a common method to bypass gateway security. While no scripts were explicitly extracted, the PDF structure and extensive URL usage suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://seumenha.ru/strik?utm_term=paranormal+activity+ghost+dimension+online+stream
    • https://cdn-cms.f-static.net/uploads/4368492/normal_6012c135f2650.pdf
    • https://cdn-cms.f-static.net/uploads/4478148/normal_606221f71e6c2.pdf
    • https://cdn-cms.f-static.net/uploads/4417806/normal_605e12079acf7.pdf
    • https://cdn-cms.f-static.net/uploads/4467979/normal_5fd77ff8c8d27.pdf
    • https://gariligiradafa.weebly.com/uploads/1/3/4/0/134041078/73f9cb.pdf
    • https://static.s123-cdn-static.com/uploads/4485457/normal_5ff28e11a50be.pdf
    • https://jipubegu.weebly.com/uploads/1/3/1/0/131070098/9bbf4.pdf
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/8309106.pdf
    • https://sebumeganajili.weebly.com/uploads/1/3/0/8/130874272/7155504.pdf
    • https://cdn-cms.f-static.net/uploads/4415937/normal_604b63dcc9e0c.pdf
    • https://static.s123-cdn-static.com/uploads/4450727/normal_5ff265ba697c9.pdf
    • https://cdn-cms.f-static.net/uploads/4465709/normal_6040d9db73285.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1769173f-75b4-4685-ac3b-865958918432/61951795448.pdf
    • https://uploads.strikinglycdn.com/files/68e64785-9ef1-41c6-be56-d0b566e12603/89169379003.pdf
    • https://s3.amazonaws.com/simujix/tarzan_the_ape_man_1932_full_movie_online.pdf
    • https://uploads.strikinglycdn.com/files/0f9e73f7-a866-4833-92f8-2b2ac696fcd6/food_safety_modernization_act_2018.pdf
    • https://uploads.strikinglycdn.com/files/2a295aa2-5fa9-43be-bf18-619bee959ceb/48172957460.pdf
    • https://uploads.strikinglycdn.com/files/d3867664-f199-4bcf-9ad4-063c92451a8c/77577136584.pdf
    • https://uploads.strikinglycdn.com/files/a54edec7-1bcd-4a91-8598-19e8ae8237ea/besozazuxajepakozulivalu.pdf
    • https://s3.amazonaws.com/xozeb/maze_runner_the_death_cure_full_hd_movie_download_dual_audio.pdf
    • https://s3.amazonaws.com/jarirotexab/gilabavevekugobomakepabi.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_off0000e8b9.bin
3c80565b3a5c04f62dcab38f123d180ac237c968c6ca1505b44b28c5b4742ca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 5516 bytes
font_01_sfnt_off0000fb58.bin
bd5c33d0d32b1ac50123f53f5e4faf997eec393e721df512a08c113a2b8340f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 10784 bytes

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