Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddabf0719da6aa0d…

MALICIOUS

PDF

70.7 KB Created: 2021-02-24 05:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 913ee9d03be22a4daa463d9d86224be5 SHA-1: 0deffa56c4a42d83a62cd57b5920fcc0aa78d322 SHA-256: ddabf0719da6aa0d3e82f69d9456677c499bfcc79d3328330882328cc3768004
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous external URIs pointing to other PDF files hosted on various domains, many of which appear to be disposable. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=system+dynamics+for+engineering+students+solution+manual+pdf PDF link annotation
    • https://kovexinuzik.weebly.com/uploads/1/3/0/8/130815277/rolusavasutuzu.pdfIn PDF document text
    • https://bipozoxadedisaj.weebly.com/uploads/1/3/1/1/131164124/xuxejax_texagopoxo_fogekusafekufiw.pdfIn PDF document text
    • https://sejimewopokotas.weebly.com/uploads/1/3/5/3/135350214/tolewaruf_tadubijepo_jabazofilamo_dadof.pdfIn PDF document text
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/db15e.pdfIn PDF document text
    • https://rirejanumaxix.weebly.com/uploads/1/3/4/6/134631236/36c28d3892.pdfIn PDF document text
    • https://wakokozetu.weebly.com/uploads/1/3/4/3/134307835/1e307cbb108ec7.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/parkour_games_for_pcny5vy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384048/normal_5ff9c2f539a74.pdfIn PDF document text
    • http://stixlife.info/dead_and_gone_lyrics_timberlakeim0ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450636/normal_5ff7bf56dd893.pdfIn PDF document text
    • https://gerasulas.weebly.com/uploads/1/3/4/8/134861388/xeluvitabewamap.pdfIn PDF document text
    • https://degufulu.weebly.com/uploads/1/3/1/3/131379990/tinuwo.pdfIn PDF document text
    • https://bagibobujinokat.weebly.com/uploads/1/3/5/3/135312275/1de931222701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466135/normal_5fd2846d2167e.pdfIn PDF document text
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/9230299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_5fd28ad399c67.pdfIn PDF document text
    • https://nujuwededewomoj.weebly.com/uploads/1/3/4/3/134305400/vegep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kewivifonawati.epizy.com/10846169924.pdfIn PDF document text
    • http://bazogito.epizy.com/grounded_theory_methodology.pdfIn PDF document text
    • http://finubovuputok.epizy.com/44609693793.pdfIn 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_off0000d5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FD 5680 bytes
SHA-256: 934f20c7bc651618c325226ab751191676db9a6405e016281b6db61949205296
font_01_sfnt_off0000e94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 10496 bytes
SHA-256: de768e9212ea601984b920188f8b37c7ce3403e2d61469c65d62217ee5afbbd0

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