Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff29c051823234a5…

MALICIOUS

PDF

70.0 KB Created: 2021-02-06 02:38:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bd2d3007cf1f21923fba60f3c5bfe749 SHA-1: c4edb3d64d8a42df9b1a63c811bc9bd39824d7a8 SHA-256: ff29c051823234a5551f22db453c7b8bbe82af1f47d266b400a1a99f55eed141
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including random and disposable URLs, and a high ML classifier score. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. The document body, though heavily obfuscated, suggests a lure disguised as a guide, likely leading to a secondary download from one of the numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/aws?utm_term=siren+blood+curse+trophy+guide+and+roadmap PDF link annotation
    • https://cdn.sqhk.co/mirusopujame/eqdhfic/puwazewapenilukapefidot.pdfIn PDF document text
    • http://buylettersonline.com/gekojelkk6gx.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/trivia_crack_questions_and_answers_historyigamk.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/ic0haih/91705602264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448116/normal_6011ab19011e8.pdfIn PDF document text
    • https://cdn.sqhk.co/rejinujo/EMhd5NG/46012551220.pdfIn PDF document text
    • https://cdn.sqhk.co/vagofedewat/ahbif8M/railroad_crossing_laws_california.pdfIn PDF document text
    • https://cdn.sqhk.co/bifoligi/VV23heZ/mominabikiba.pdfIn PDF document text
    • http://salonvarna.com/55289956496bx57i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458856/normal_5fdd691537cbd.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/tQjg4gd/82379679002.pdfIn PDF document text
    • https://cdn.sqhk.co/taxeseta/xgjihdL/xonenuzixetazubiliratotux.pdfIn PDF document text
    • http://ozalupa.space/bowewulebizanabegixidefafmncew.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/fCojdhe/jam_looper_pedal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451753/normal_5fe13e702b191.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/jdgNji9/68418964200.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/jfg2Tie/bidalitaxodalexunutubepe.pdfIn PDF document text
    • http://boost-shop.xyz/aws_amplify_s3r69iv.pdfIn PDF document text
    • http://itawomen.fun/5786832980297fs8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 5832 bytes
SHA-256: fd40673b6a98496c5438cd0e92ac4309a6e23b5f3db54b220d6fbd8775de1b1d
font_01_sfnt_off0000e826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 10092 bytes
SHA-256: 8ecdfa829d4a4f8c90db8fad84e757aa2ee7efe7424bd79202a1a0a562a4e395

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