Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c3d43c480dd23c…

MALICIOUS

PDF

79.5 KB Created: 2021-03-30 09:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 08e5395d08f00d3b01a0fa6b9793de03 SHA-1: af821ebd1b6c2b34fc0b8ae9adb1c7fd1923c186 SHA-256: 98c3d43c480dd23c0b95f799ede887403d96b20cd0cb53e3f069f8d12fe716d8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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/award?keyword=yasin+sharif+in+english+pdf PDF link annotation
    • https://kuwujevo.weebly.com/uploads/1/3/4/8/134864034/favalonawef-pevusasivafe.pdfIn PDF document text
    • https://tozilamuvopodes.weebly.com/uploads/1/3/5/9/135966944/d0b66b9a477.pdfIn PDF document text
    • https://cdn.sqhk.co/japokaxe/fhfjiWa/espn_nfl_power_rankings_week_3.pdfIn PDF document text
    • http://navaram.online/bolexutovemah1qxh.pdfIn PDF document text
    • http://my-credit.info/thus_spoke_zarathustra_best_translationtrtox.pdfIn PDF document text
    • https://somubafe.weebly.com/uploads/1/3/4/4/134444697/zatoxobetujutuf-redamofo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446759/normal_5ff275194691f.pdfIn PDF document text
    • https://cdn.sqhk.co/gidetixi/jeiiiiS/crazy_dino_park_epic_eggs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378393/normal_604421d47f61b.pdfIn PDF document text
    • http://talkme-news.info/69862596729r1e63.pdfIn PDF document text
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/xibagagexobu-fodugi.pdfIn PDF document text
    • https://nekusudowup.weebly.com/uploads/1/3/5/3/135315851/roxobumimitum.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/bibDf2z/14751802654.pdfIn PDF document text
    • https://wetejitaxazis.weebly.com/uploads/1/3/4/3/134306742/1238dc76.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/fbhJMST/32471526102.pdfIn PDF document text
    • http://erogan-oficial.site/ipod_touch_update_to_ios_13oenbv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495391/normal_5fc6a479424ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411480/normal_6004b497ac68a.pdfIn PDF document text
    • https://balolekuzuwuvaz.weebly.com/uploads/1/3/0/7/130740598/xolejowojo.pdfIn PDF document text
    • https://takojozosuliwo.weebly.com/uploads/1/3/0/7/130739597/edc66f9b62a607.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/c0403cef-c69e-45e1-8c94-da73ab56b2c3/5445867231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e7f23cd-8796-4ba5-84fe-e9ff0f1b1ec2/behringer_xenyx_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/066c459f-d299-4664-8b7f-a71814b48446/xfinity_remote_codes_for_onn_roku_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01412dd1-53f7-4651-a2ce-f63b4c734c55/what_is_the_definition_of_liminal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a32c95f-616b-4096-b8cb-f5a1da5727fc/35669185671.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_off0000fb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB53 5264 bytes
SHA-256: 05515ee291769f17d9f79b5b9792cf35d1aaab00865b29ab9fc87e5eab1f6bf8
font_01_sfnt_off00010d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D35 10280 bytes
SHA-256: 583c66f5a5777ce72a5555ef9e314d9827a15279b802648467dd4d3bdbe0373b