Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ba7b2c5a1501f7…

MALICIOUS

PDF

70.3 KB Created: 2021-05-05 22:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd2af2ad844c25e2fe044e7ed987471c SHA-1: 79977a38c677e380ee2c9e1b6714552c71227090 SHA-256: a6ba7b2c5a1501f7c862b2ee266c7cc49660964b4560c454372a88ba60ac5c26
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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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 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://jacksth.ru/strik?utm_term=are+bob+evans+mashed+potatoes+real
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/4591116.pdf
    • https://cdn.sqhk.co/lakekomum/jazxIgi/the_lightning_thief_chapter_15.pdf
    • https://cdn.sqhk.co/vagewovupug/YF0mibJ/cruise_ship_jobs_payment.pdf
    • https://tusuwijajibu.weebly.com/uploads/1/3/4/5/134517525/9541591.pdf
    • https://nojilanoxejajej.weebly.com/uploads/1/3/4/8/134856497/c8a598e.pdf
    • https://cdn.sqhk.co/zitiwofiru/fnijO3g/at_t_tech_support_360_charge.pdf
    • https://tidevaxapoled.weebly.com/uploads/1/3/5/9/135971763/juvumekej_sisidepig_kagefaba.pdf
    • https://pajowivi.weebly.com/uploads/1/3/4/9/134904739/povire.pdf
    • https://lamamamim.weebly.com/uploads/1/3/1/6/131606140/8861252.pdf
    • https://cdn.sqhk.co/gapebeve/ihljgiR/nuevo_pase_elite_de_octubre_2020.pdf
    • https://cdn.sqhk.co/salijuvam/eeiPEtv/42245352125.pdf
    • https://nigipesifagezeb.weebly.com/uploads/1/3/1/4/131411762/1305549.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jumivozapiv.rf.gd/girikovukibovizak.pdf
    • https://uploads.strikinglycdn.com/files/60802ccf-2bf4-42d3-9903-66874b116f35/57569018425.pdf
    • https://uploads.strikinglycdn.com/files/9f6800f4-8631-428c-9f77-c0d211f4fa1b/tc_electronic_polytune_2_vs_boss_tu-3.pdf
    • https://uploads.strikinglycdn.com/files/ec8a25f3-2956-4fa6-948f-a048eb4edf3d/82197351408.pdf
    • http://womunek.rf.gd/36848968503.pdf
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_cdb0a0d647484c7f8458e44d34313e31.pdf?index=true
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_731ea4ce953a404c9a2e57f56899eab9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d4c89f29-b29e-4557-ac98-e50c8e4ae277/5273730001.pdf
    • http://bufagefitazi.rf.gd/acrobat_writer_free_download_windows_7.pdf
    • http://gaviguxugopa.rf.gd/97341813981.pdf
    • https://fa3f2985-242d-4a4c-93c0-6adbfb259eaf.filesusr.com/ugd/8dbe7a_895e3bf2a1ff4eb093eeaac48a0c0488.pdf?index=true
    • https://uploads.strikinglycdn.com/files/282324b2-bb6c-476e-9aad-116c33936621/xefurarotoxu.pdf
    • http://taputideletu.rf.gd/ich_harmonised_guideline_q3c_r6.pdf
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_372f76f30a3a4490ab01579b0a67ae8e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f1.bin
155662acde1a189763955c4ed57e45c426de2d5dafed2890d12501076b3d886d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F1 5388 bytes
font_01_sfnt_off0000e316.bin
7ad6f7511c9cba0c57c9729746325a82a060ee76395fbdf92e694d2a28864d24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE316 11312 bytes

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