Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac05a20e45576936…

MALICIOUS

PDF

117.9 KB Created: 2021-04-05 00:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0a3eea279a7e45d4e3fb30cf1a8d5fa5 SHA-1: 1e32fbd16ad00f6b5974a37ef1d47fef0e93b722 SHA-256: ac05a20e45576936a6c6e0c14ffe35b4ede8fcb6790c6f10b71d865e32e2b4f7
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the document's structure suggest it's designed to redirect users to other sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://zajinet.ru/wix?keyword=unlocking+the+bible+david+pawson+pdf+free+download PDF link annotation
    • http://sodahq.pro/91991640930kbbr6.pdfIn PDF document text
    • http://realwockyc.info/rotten_tomatoes_best_movies_2018_audience_scorefj20r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373240/normal_6010a6c56dba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386084/normal_600dce1391f07.pdfIn PDF document text
    • http://aycotoro5.xyz/24199342253nm7k7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/043cc375-c06e-4d34-aae8-5217edce0973/zuguwexadomalawonu.pdfIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_c979bd8fb93a4b46a2ed81fc6b8c9503.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/153686e8-0332-4ca8-a1be-c0d44c069a52/4743806536.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_0cdf8d716ecf471e93f9b4bd749fb79b.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_3c62f7ca2e4a4943900048bb0409c7cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83f21890-d507-46e0-ac51-1ddc55599afe/i_hunt_killers_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/858ee43f-b0c4-4f94-842d-856c38d9436c/how_to_turn_off_water_heater_alarm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ae1c619-818c-49c4-897d-d9a1864f0f1d/how_much_do_daycare_workers_make_a_month.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7563d82d-5ee9-45b5-8f23-bf636fb9c182/renogujematoxoduvodim.pdfIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_1bc4042f64fc449aaacab4a4f4f69948.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_off00018fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FE5 5764 bytes
SHA-256: e033d8aa978d15e6050e2e369275baefcfa006d10768b5fb5b1083f18bd8e839
font_01_sfnt_off0001a395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A395 11408 bytes
SHA-256: aa0bc2e3313e0e1a891690ed1de22185d4ff7f34ae309ebe07ae1994d2a4fe87

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