Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cb2f253ff1f13e…

MALICIOUS

PDF

74.8 KB Created: 2021-04-05 10:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 45dfd8a8f397759bbe78a52ae4f03421 SHA-1: 71f507767efcff6dd618e3c59f30c3b284dac7e1 SHA-256: 37cb2f253ff1f13e6aa4db7ed1c08f00abf92e288246bae2dca47dacf14651b6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by multiple heuristics as a link farm designed to host numerous external links, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of redirecting users to potentially harmful content.

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://golowaki.ru/wix?keyword=black+and+decker+deluxe+router+guide+76-234 PDF link annotation
    • http://realwockyc.info/jvc_model_number_jlc37bc3002qtaom.pdfIn PDF document text
    • http://zalavsky.ru/agenda_docente_2019_argentina4ev5h.pdfIn PDF document text
    • http://mandarins.space/how_to_start_a_bakery_business_in_nigeriadath2.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://tepepowaz.22web.org/how_to_describe_a_login.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417205/normal_60546c3c766d2.pdfIn PDF document text
    • https://dojoxokixen.weebly.com/uploads/1/3/4/8/134878929/5302a55207fdc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392864/normal_606361a8b1a6d.pdfIn PDF document text
    • https://fiwudarive.weebly.com/uploads/1/3/0/7/130775392/muzorulinosili-suzakurimolemi-xugukobajig.pdfIn PDF document text
    • http://jopkapopka.online/zanitilokuy39ck.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413718/normal_5fd1bb66dee7c.pdfIn PDF document text
    • http://boost-shop.xyz/642543939973dir.pdfIn PDF document text
    • http://lnstagram-office.com/wugalenasininp4i94.pdfIn PDF document text
    • http://idealica-official.website/lusogobimoz999f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_b7765b6d3fed4afdba952a72b1fbcba5.pdf?index=trueIn PDF document text
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_ee06e334cb84404080274b81b10ff9a1.pdf?index=trueIn PDF document text
    • https://f50ece36-1901-4a7b-9396-968a400df7f4.filesusr.com/ugd/3ecb95_9ddf3a07babb4cb8bdea84aa9537167a.pdf?index=trueIn PDF document text
    • http://saditufawixak.rf.gd/bye_bye_blackbird_sheet_music.pdfIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_e41a80d603804de6be31a288cd2c6718.pdf?index=trueIn PDF document text
    • http://sivuvupaxiju.rf.gd/what_are_the_4_types_of_satellites.pdfIn PDF document text
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_71e9d674a3a941b594fd2b8eeb61a662.pdf?index=trueIn 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_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 5760 bytes
SHA-256: 1bbec235fa9a3bf90c528b30c5b1ce6903b2963c0383a16721384bab895bef27
font_01_sfnt_off0000f67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 11348 bytes
SHA-256: 5faf08e30a372f89ce67cf9fcbeba0eab74c8a75107e18361ede066d5aa9a68a

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