Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9c41a5b1f4628d…

MALICIOUS

PDF

90.3 KB Created: 2021-06-03 16:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 26e36d6b7f892730422caf05f241b75e SHA-1: dc4a0303940e094e3d1f5ca833ce769cea7f7208 SHA-256: 0b9c41a5b1f4628d83f304bd31e1cc2fb58bbcdc1ab65328784f5388fa5b6238
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://archism.ru/pbw?utm_term=dave+east+karma+2+zip PDF link annotation
    • https://kewidavarij.weebly.com/uploads/1/3/4/6/134696647/filubij.pdfIn PDF document text
    • https://sifejolo.weebly.com/uploads/1/3/1/4/131410009/vunaloxefir_vivisubomu_gudulup_sasilezizivagon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370307/normal_604d0b08500fb.pdfIn PDF document text
    • https://rivakevalitute.weebly.com/uploads/1/3/0/8/130813818/jazadukijonidapoxi.pdfIn PDF document text
    • https://navijaxilof.weebly.com/uploads/1/3/2/6/132696044/3460994.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416671/normal_5ff3b8b3dba4e.pdfIn PDF document text
    • https://xuzojawuwakobo.weebly.com/uploads/1/3/4/3/134312069/b138d7f591f31.pdfIn PDF document text
    • https://fobinoxibenor.weebly.com/uploads/1/3/1/4/131437242/8c5862a8010f02f.pdfIn PDF document text
    • https://gajinuware.weebly.com/uploads/1/3/4/5/134597963/1e38d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_6057c0415e408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470839/normal_600c2520441ca.pdfIn PDF document text
    • https://boviseweduxiraz.weebly.com/uploads/1/3/0/7/130776594/fupuxukivi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_60636d99e39ed.pdfIn PDF document text
    • https://tirokaroxere.weebly.com/uploads/1/3/2/7/132740449/wuwetawafavenur.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/0b48a97f-675a-4850-ab4c-35381c8e08d0/is_emotional_pain_real.pdfIn PDF document text
    • http://sajateves.pbworks.com/w/file/fetch/144467730/million_dollar_habits_stellan_moreira.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/f/blockman_go_hack_apk_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1238a77a-4b5e-4e9e-9234-09425eb5155b/head_first_lyrics_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33de77a7-0b58-4f14-8838-e5688e6f8efa/download_kick_the_buddy_forever_android_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3675d6fa-7fba-4040-b161-bef74e03924a/what_if_god_was_one_of_us_songfacts.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144421254/cease_and_desist_letter_slander_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0620056b-4838-4c15-941c-47a5adca1c19/is_lamb_gyro_meat_keto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a053dc4b-686c-4497-b3a3-dcd9b1fac646/verdade_ou_desafio_x_apk_premium.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef044ee1-0e66-4127-803d-4c3eecebb599/hypertensive_emergency_treatment_guidelines.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/starbucks_barista_espresso_machine_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcc96333-5b61-42bf-a6df-c5225fe079b6/26000650607.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_off000123b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 5236 bytes
SHA-256: 126eefec265bbc597c3aae904cc16652041a02c0c048a1042ac5f6bcf04f45d6
font_01_sfnt_off00013589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13589 11368 bytes
SHA-256: 26a75cad25c91443c4c965f4c5b7b55cee391120b9ae09eb55f6c3dfb8aeb534

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