Malicious PDF — malware analysis report

Static analysis result for SHA-256 af56e34b70008cf2…

MALICIOUS

PDF

75.0 KB Created: 2021-04-21 13:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ec6253e8263ef413cd2e06445699af76 SHA-1: 24febb8fb4eda21b1c11ab081b7bf8eaeeda8f24 SHA-256: af56e34b70008cf2f7306216aae62da94ba098821472f342d8ec9757237a2adb
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 phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=pci+bridge+design+manual+chapter+8 PDF link annotation
    • http://dle-tpl.site/speed_queen_stackable_washer_and_dryer_setipeab.pdfIn PDF document text
    • http://imedo.ru/chocolate_cake_recipe_homemade_chocolate_cake_ki_recipe6snlk.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/hjexDha/xosinive.pdfIn PDF document text
    • https://nedebubet.weebly.com/uploads/1/3/4/8/134854500/sefelit.pdfIn PDF document text
    • https://lumirofelefepo.weebly.com/uploads/1/3/4/8/134892557/buwevo-tomorulewokowil-paduruvozog.pdfIn PDF document text
    • http://tonojodozif.mypressonline.com/31727994595.pdfIn PDF document text
    • http://dejivuxa.mygamesonline.org/bartok_mikrokosmos_volume_2.pdfIn PDF document text
    • http://avtoshkola-region26.ru/jivovedigakubibisol1d7kp.pdfIn PDF document text
    • https://cdn.sqhk.co/fekurisakez/chaAgiI/kerinizunositudipuxud.pdfIn PDF document text
    • https://cdn.sqhk.co/muvifisi/7hajfTg/53461565902.pdfIn PDF document text
    • https://zugudomumomaxix.weebly.com/uploads/1/3/5/3/135324912/365bd45cc85280.pdfIn PDF document text
    • https://cdn.sqhk.co/sovebiba/Kjh8Hhi/warazovaz.pdfIn PDF document text
    • https://cdn.sqhk.co/boxumiza/Wj0iaya/radiation_island_mod_apk_free_craft.pdfIn PDF document text
    • https://cdn.sqhk.co/kezavilageg/cjcyAdb/bofuz.pdfIn PDF document text
    • http://zukixulen.mypressonline.com/coleman_generators_near_me.pdfIn PDF document text
    • https://xumijarivibamow.weebly.com/uploads/1/3/5/3/135339210/c5b58.pdfIn PDF document text
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/4561520.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_69cd8325a404473b9818ba1b2616b098.pdf?index=trueIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_01f37b876c2d496c8e27df8c9d8cbe38.pdf?index=trueIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_bcf589cfe89b409b8b78e9f10957712a.pdf?index=trueIn PDF document text
    • http://xemunebo.atwebpages.com/anatomy_drawing_study_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 5596 bytes
SHA-256: dbccf8cd3085042cea0593533d356c22de4b0de31acc9fee2ec5965d4fdeda75
font_01_sfnt_off0000eba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA2 10824 bytes
SHA-256: 72471f5c0d7f1f96cbd41e66b57a7bcce5ccc5876f1535bf4457f3f57bf578cc
font_02_sfnt_off0001107f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2