Malicious PDF — malware analysis report

Static analysis result for SHA-256 22cd50ad7c48bb19…

MALICIOUS

PDF

71.7 KB Created: 2021-03-04 23:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b8240cb1b89a1022a99cb3a1e1736b0d SHA-1: 1585457fa15b94f1bd92aa09faed86e024cdedc3 SHA-256: 22cd50ad7c48bb191efce1940ae57b1106d6bb5ad56edff3596c28c259a3f971
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's primary purpose is to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/aws?utm_term=calories+in+dd+boston+cream+donut PDF link annotation
    • http://idealica-it.website/43858849289j38ng.pdfIn PDF document text
    • http://clientbluebadge.com/2014_polaris_sportsman_400_ho_top_speedycj7y.pdfIn PDF document text
    • http://amsidisi.xyz/434195738401b035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488346/normal_5fd847f7ada17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_601f2a3586c34.pdfIn PDF document text
    • https://seruvukajobal.weebly.com/uploads/1/3/4/4/134479042/9a2122b04183e.pdfIn PDF document text
    • https://fozuxuvaporoj.weebly.com/uploads/1/3/1/8/131856883/1c30b28c81d294.pdfIn PDF document text
    • http://zdsshop.top/downy_dryer_sheets_and_mosquitoes5487h.pdfIn PDF document text
    • https://waxalema.weebly.com/uploads/1/3/4/3/134364729/c9de6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465396/normal_5fe73204dd478.pdfIn PDF document text
    • https://zepitobazelaki.weebly.com/uploads/1/3/4/6/134619491/tagaj-debulobilofez.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/2ec23137-8207-49c3-a200-58b3e241e9bc/68604650639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffc49d0d-4eff-401b-a8a8-ab1dfd37b148/words_their_way_spelling_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/975cffdf-f282-4949-897a-602673fb4f8b/tofagigasebit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2267df1f-1bc2-4d94-bf3a-a5f411857f57/tintin_comics_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cfbbf6a-2ede-4d30-b571-1742a7872fe2/81511715021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f717dd-9ac2-4bb6-81b4-e7c42c174edc/adobe_premiere_pro_cc_2017_free_download_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ae82b7-15b0-44c7-b17f-d572e2c3b0bc/what_is_write_before_christmas_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b75553-b271-4b50-9eed-2affb9e7f6e5/37085018590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f54d9dec-d25f-45e7-be62-f0a1cf9f8b53/13993414449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aad0ea24-097c-4500-a62b-2193be22d536/96895813282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1afe67c1-a1f5-4c73-9eaf-03dbfcd16d6b/98813849500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84133e0d-ee8a-4d61-8c2d-fdddb1a1b14e/zunapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b53390cd-1178-4e18-9de3-0f92bfcb7996/49995966653.pdfIn 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_off0000da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 5128 bytes
SHA-256: f5538f5ce5dce5f0c2b1bb6fdcbcbeda17ae3a01c74679f5e03802487a75805c
font_01_sfnt_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 11136 bytes
SHA-256: 8da284f43e749169afb73e145a6f916b3ff71e6a992427433514beebfb94d088

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