Malicious PDF — malware analysis report

Static analysis result for SHA-256 3787e21e03a4bc22…

MALICIOUS

PDF

79.3 KB Created: 2021-05-03 06:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd37d8c2175524b491cf11da763d2d75 SHA-1: d7c7136df564e2a7d59ab4a5d3aca82e314b0216 SHA-256: 3787e21e03a4bc2257e3ce19adceb6a895fc22f8dac3c928fbd8d3a5236c8f59
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links, with a significant portion pointing to disposable hosting. One notable URL, 'https://crophysi.ru/strik?utm_term=snow+white+and+the+huntsman+director+wife', is flagged as suspicious. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to potentially harmful content, aligning with phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crophysi.ru/strik?utm_term=snow+white+and+the+huntsman+director+wife
    • https://kefuvavubuxega.weebly.com/uploads/1/3/1/1/131164002/1437558.pdf
    • https://pibusabet.weebly.com/uploads/1/3/4/6/134695111/xunabun.pdf
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/7752223605d.pdf
    • https://vidatizotasajad.weebly.com/uploads/1/3/4/0/134017381/5126771.pdf
    • https://tunoritusaw.weebly.com/uploads/1/3/5/3/135328070/jevelagi-zubitalifexa-korasaxow.pdf
    • https://cdn.sqhk.co/sewenajete/dMKjOBS/64953025525.pdf
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/sexisimove.pdf
    • https://migigazafakag.weebly.com/uploads/1/3/4/3/134377970/5415883.pdf
    • https://bigakajufejala.weebly.com/uploads/1/3/4/2/134265656/2855692.pdf
    • https://fujolununepa.weebly.com/uploads/1/3/4/6/134683680/xitadulelanopu.pdf
    • https://nuvafuriwevejuf.weebly.com/uploads/1/3/2/8/132814848/dapalidikoxadupufo.pdf
    • https://wokoxulepimam.weebly.com/uploads/1/3/1/4/131438011/fbd2939e3e.pdf
    • https://dexugagemer.weebly.com/uploads/1/3/4/7/134715037/sisazep.pdf
    • https://levazisibeguni.weebly.com/uploads/1/3/1/0/131070530/5675618.pdf
    • https://jilazokezabise.weebly.com/uploads/1/3/5/2/135296918/3835649.pdf
    • https://pedexanagokol.weebly.com/uploads/1/3/4/6/134635549/beteluz.pdf
    • https://cdn.sqhk.co/fedelubu/3hfifB1/radiosender_metal_rock.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_eb62b9afafe446b7a90c1d828e646484.pdf?index=true
    • https://s3.amazonaws.com/fedojigudaj/java_programming_language_beginners_book.pdf
    • https://s3.amazonaws.com/jotizifime/sony_hdr_as100v_wifi_password.pdf
    • https://8994dc82-3839-475c-8de5-8afaa5c13229.filesusr.com/ugd/798b5e_6ed927f459a248738cb939f03b3a5b19.pdf?index=true
    • https://s3.amazonaws.com/pegozegi/hollywood_animated_movies_2016.pdf
    • https://s3.amazonaws.com/levovod/vatanuxad.pdf
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_f12a23f326d742ebbafb68f43c163022.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_off0000f634.bin
1918e67711f3b94ca5ee045a668002690cc3469ebfb1576a4b77607fe25aa7ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 5424 bytes
font_01_sfnt_off00010891.bin
f5153eaaa3c403d6ce0a00441bf13390445f4d2c97627c3eae1436dab2b234fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 10752 bytes