Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca17eb8835e0dcab…

MALICIOUS

PDF

78.3 KB Created: 2021-03-07 11:15:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08d21c387a079afc120ef208ea447aa3 SHA-1: 7fa11160f962ea5093dc74d630a405f81efa410f SHA-256: ca17eb8835e0dcab1d321a8ea2fd94ed903acad42c20b5134ef7902df9dc4a89
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to various websites, some hosted on disposable domains, suggesting an attempt to lure users to potentially malicious content or phishing pages. The PDF structure itself does not contain exploitable content but serves as a vehicle to distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=casio+f-91w-1yer+water+resistance
    • https://mozufidapu.weebly.com/uploads/1/3/4/0/134012608/pokokezutib.pdf
    • https://muwewixobajigu.weebly.com/uploads/1/3/4/3/134312624/a6561e5e8cf4.pdf
    • https://static.s123-cdn-static.com/uploads/4470843/normal_5fdf4f12553df.pdf
    • http://xarapover.mygamesonline.org/vivibejodamelujif.pdf
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/xovebadogesiwoj.pdf
    • https://cdn.sqhk.co/zoluxoni/eNijyja/samsung_smart_switch_mobile_apk_for_xiaomi.pdf
    • https://cdn-cms.f-static.net/uploads/4417032/normal_6041ccc531036.pdf
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/xidutav_nagapokilapoz.pdf
    • https://cdn.sqhk.co/subilikiwi/giagfbA/jafiv.pdf
    • https://cdn-cms.f-static.net/uploads/4486987/normal_603c347cd6e2c.pdf
    • https://lejigatoni.weebly.com/uploads/1/3/1/8/131871980/7244283.pdf
    • https://cdn-cms.f-static.net/uploads/4492246/normal_601d149141f18.pdf
    • https://cdn.sqhk.co/jasowipe/9jayiae/classic_helicopters_for_sale.pdf
    • http://lozipazom.sportsontheweb.net/firasoropibigoziroloded.pdf
    • http://mumolazesinidix.getenjoyment.net/what_is_the_difference_between_hatha_and_vinyasa_yoga.pdf
    • https://cdn.sqhk.co/webepinovet/hcrYjcK/6976814661.pdf
    • https://xufevojulan.weebly.com/uploads/1/3/1/3/131384667/f0130f1488b965a.pdf
    • https://dodoluwateja.weebly.com/uploads/1/3/1/3/131381806/rifizolimun-zudikesazaz-jobag.pdf
    • https://cdn-cms.f-static.net/uploads/4483338/normal_5fd8c0ba76b69.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_105376139ac447179a56a39117edd157.pdf?index=true
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_a04db2def51f49969420efa8f54d7439.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_off0000f362.bin
737e3ed5adec802cc2cd91747772979b2c45c3097057662fcc06ee9b157e6123		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 5180 bytes
font_01_sfnt_off00010535.bin
c69e43bd838d0df13e0aac458d550de4a4feb7b4cc5b9eb23104673dea61a7ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10535 11368 bytes

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