Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4a6df9ae915b41…

MALICIOUS

PDF

80.4 KB Created: 2021-03-24 23:16:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05b63e7268d65b1e5e9f64aa2ecb1377 SHA-1: efea90852cb7a1cfd48ecd4ba4227082fc6a1fa7 SHA-256: 7f4a6df9ae915b41d2a98e1cd6ae5061fa494bfdabb0d8d9feae3fa7ead85bb1
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/award?keyword=conductivity+test+of+water+pdf PDF link annotation
    • https://cdn.sqhk.co/burajugi/wVhaogj/29608593582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_601344ddaaef3.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/yjigdI4/airplane_movie_quotes_good_luck.pdfIn PDF document text
    • https://cdn.sqhk.co/wopeporamo/Vtdhgif/xikolararezumadadikidefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413240/normal_601b7b7aa7cf3.pdfIn PDF document text
    • https://cdn.sqhk.co/vixawutozama/igjgoje/durulumajuwetiruro.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/jaierL4/tesuwurojivivumifaber.pdfIn PDF document text
    • https://cdn.sqhk.co/jiledexuda/rf73thg/70140454430.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/Thfjhgi/91096689796.pdfIn PDF document text
    • https://cdn.sqhk.co/regomesu/giBYKij/virus_definition_biology_simple.pdfIn PDF document text
    • https://cdn.sqhk.co/kibukumivu/gjegjD2/41811733846.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_373578d7f9d847b0a3296525279d0623.pdf?index=trueIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_d20f8c9a6935434c82b6d9b8dabada69.pdf?index=trueIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_1115ed0b9a484adea55cb86a718cbda2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donarepemi/ableton_live_9_mac_crack_ita.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_612cd8c132594cdd93c5f12688a87c0a.pdf?index=trueIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_b8988bd442b94b31945c981fe4e5d643.pdf?index=trueIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_eb6d32014bcf4bd4bdea6cdc5665bd48.pdf?index=trueIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_ec77555932f340318d776b8f9948abe4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/sufobalepino.pdfIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_51e5867328e0430b80bd6bc9f6c89397.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/40276163482.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/35892095685.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_25319ad262d84790955fc83e5476b481.pdf?index=trueIn PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_bba37b9f1b744288aa71c773fcaccb8a.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_off0000fd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3D 5276 bytes
SHA-256: e3e9b01eb71dbcb3652d42c262189c976cf830a8be5d73c17c0c306de40c0321
font_01_sfnt_off00010f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5C 10808 bytes
SHA-256: 32270d10682624f2087833d460c6447556c83ce62c6196f3b4209387b923745e

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