Malicious PDF — malware analysis report

Static analysis result for SHA-256 683ef0c4df13f7bf…

MALICIOUS

PDF

78.7 KB Created: 2021-03-23 13:47:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3ebb6831bd4caa626e1b1f05c7f6e634 SHA-1: 5ec7fb1324d7d2253babed9397a95edcc1135701 SHA-256: 683ef0c4df13f7bfde7e1a9a74763e6c782e478cece11ce7013cdae9e68c09aa
206 Risk Score

Malware Insights

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

This PDF document, identified as malicious by ClamAV and an ML classifier, contains a significant number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf and mentions 'Stealth cam command setup', hinting at a lure. The presence of numerous external URLs, including one pointing to 'seumenha.ru', indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=stealth+cam+command+setup PDF link annotation
    • https://cdn.sqhk.co/pafevola/dubx0KR/free_easy_printable_crossword_puzzles_with_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/ijhfhg8/xetojetososoxik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391340/normal_600a031732ccc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380213/normal_5fc5763d81ca3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478134/normal_6041b512a384d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376099/normal_602088ea3aaa7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_080dbdf362f84642bb1bb68084576054.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a64bf1f5-7506-46fb-af1b-d06ae4e78574/sixitesowurovadarerebo.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/sonafolubixowesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a391ce-5bbb-4f6e-93a1-35dc3016d822/blackstar_id_core_stereo_10_v2_review.pdfIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_ae528f10767c4ad09c9b83b46a357633.pdf?index=trueIn PDF document text
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_a81a827cb1d647bbbcc1558fecbf30b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/papuja/ibps_clerk_2018_books_free.pdfIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_7eeb544dc13c4cdbb2569b5c76a0462d.pdf?index=trueIn PDF document text
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_677ff2a3a51c49caafe2239d6c96ca0f.pdf?index=trueIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_494cea8f247b4affbe7995d0cda2e46c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/what_are_the_buttons_on_jbl_flip_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a760d0e6-c77c-42f9-b392-32b2c1cea621/dunakomazisasikofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8615dfb-1d66-4e1c-b690-bd712f213877/36914431306.pdfIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_c37c82671eac4e47ac043e52425a2ff8.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50D 5320 bytes
SHA-256: 9e06b64fbe09ebbee6ae4fc598616817d2668272a1a167fca314c755d4a76f14
font_01_sfnt_off000106fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 11264 bytes
SHA-256: cb58b0ed539fd98059394c56e41f46a2e58172cd207082b165588f7008a0af5b

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