Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d5f035bfedc68d…

MALICIOUS

PDF

75.9 KB Created: 2021-06-10 17:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e0188732965b851fa063cfa9446dda5 SHA-1: 7386e2e4bf0cf4b04fa6291d44a27d1ecf8242df SHA-256: 52d5f035bfedc68dc9463d30318c4394aba20635fe62da9b353b3dd48d50be74
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 designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/pbw?utm_term=mektoub+my+love+full+movie+online+watch
    • https://cdn-cms.f-static.net/uploads/4492588/normal_6055c99e8bc68.pdf
    • https://rulodewarozuw.weebly.com/uploads/1/3/4/6/134678260/lurubajasi-tupakukuki-duwiduk-solizomigom.pdf
    • https://cdn-cms.f-static.net/uploads/4481695/normal_5fd7ad27977c4.pdf
    • https://sebeguresed.weebly.com/uploads/1/3/5/9/135966133/rubujulewoxav.pdf
    • https://xiwesawubofu.weebly.com/uploads/1/3/4/2/134265581/siborezijotiro.pdf
    • https://pefibiwurabamiz.weebly.com/uploads/1/3/0/8/130874510/c0ea405c604b660.pdf
    • https://lurutedus.weebly.com/uploads/1/3/4/7/134775874/9721158.pdf
    • https://defoxili.weebly.com/uploads/1/3/4/5/134527702/ridogokisuwuxelomez.pdf
    • https://jadamoxor.weebly.com/uploads/1/3/5/3/135344742/731680.pdf
    • https://static.s123-cdn-static.com/uploads/4452381/normal_600395a63a799.pdf
    • https://cdn-cms.f-static.net/uploads/4393220/normal_6055306689dde.pdf
    • https://daxogane.weebly.com/uploads/1/3/2/8/132815110/sosujavaf-pexefajo-tejezemevitil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zufiwuz.pbworks.com/w/file/fetch/144944307/download_game_warship_battle_3d_world_war_2_mod_apk.pdf
    • http://ziriwuru.pbworks.com/w/file/fetch/144599727/wupexa.pdf
    • http://kafunujazuwo.pbworks.com/f/the_world_record_paper_airplane_book_john_collins_free_download.pdf
    • https://uploads.strikinglycdn.com/files/feacacbd-452f-46c7-9f49-d7dd8efcf670/og_mandino_book_the_greatest_salesman_in_the_world.pdf
    • https://uploads.strikinglycdn.com/files/2ce0da88-a199-47b7-9169-466e32bce79c/98907392497.pdf
    • http://fubajulak.pbworks.com/w/file/fetch/144714357/63455758422.pdf
    • http://juvupumanut.pbworks.com/w/file/fetch/144520590/adobe_photoshop_cs6_training_manual.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df0a.bin
a496fa843197cbd1e997aca9aa54ba321f6416da6aa3681bc8934fabbef0c7a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 5192 bytes
font_01_sfnt_off0000f0b7.bin
1da4543f7159d709869a605f45a10801733ed36958add1f2843bd379a7ba5398		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 10360 bytes
font_02_sfnt_off00011416.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11416 4324 bytes

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