Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fecace8650576b4…

MALICIOUS

PDF

73.1 KB Created: 2021-04-03 14:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c1e388b5e75b5c8f1c63bd3f28973384 SHA-1: b04b18f427ed86746c5502c0cd227d1b9417c21d SHA-256: 4fecace8650576b42a02d972a40d5774b034ca8e08fcc30a88b3c61fec0038d9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/award?keyword=convert+pdf+to+word+using+iphone PDF link annotation
    • https://cdn.sqhk.co/katutilit/d7jgiaG/special_forces_group_2_multiplayer_online.pdfIn PDF document text
    • https://cdn.sqhk.co/zimalodepafo/hOjff5Q/xopam.pdfIn PDF document text
    • https://bemujegifa.weebly.com/uploads/1/3/5/3/135312506/5646632.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/datelupox.pdfIn PDF document text
    • https://sonanibiforopo.weebly.com/uploads/1/3/2/7/132710732/2222425.pdfIn PDF document text
    • https://musevupuli.weebly.com/uploads/1/3/1/4/131438528/3ab1c0d7.pdfIn PDF document text
    • https://cdn.sqhk.co/fufowomusixi/gQu2f5l/vujimozabakexunivusibebep.pdfIn PDF document text
    • https://cdn.sqhk.co/jowepotoxum/hmKI5up/sushant_singh_rajput_songs_mp3_download_pagalworld.pdfIn PDF document text
    • http://zasijeg.iblogger.org/2494381103.pdfIn PDF document text
    • https://cdn.sqhk.co/kufusivekogo/Jpvhggd/jutusukatokilezowizipuz.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/sAgj1qO/75964593724.pdfIn PDF document text
    • https://fofirajajamide.weebly.com/uploads/1/3/4/6/134643930/rafenuf.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/cCUiihb/bomb_hunters_poki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_ab3f9e3a549f4a61ade2fe96305445b7.pdf?index=trueIn PDF document text
    • http://mokijogibosa.epizy.com/rubusofomurigema.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/nizisusuvoto.pdfIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_df9af582d97e4c7fb6e477c25272c51c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/paypal_contact_information_us.pdfIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_e0d255ce7e554b34a7688fc2d4d3c3f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/lista_pares_biomagnetismo.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_53eb0a3f3b504cf792e1dca75ce01b0d.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_off0000e3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FA 5120 bytes
SHA-256: db38ed6e6d32fdcdcca2ff251cc28425039a4f2ba6f3e3d0e6714180e8bb26bf
font_01_sfnt_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 9884 bytes
SHA-256: ae4d1c457506882e9f2cc8d5b203da29e48c99321a24fd04dae32d07b59eb0c2