Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17da5774310491d…

MALICIOUS

PDF

82.4 KB Created: 2021-03-24 12:10:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1c82a0134420160bba51b2d06923e73c SHA-1: 5a6f8e0d47e0203c83a90349d491cd52061127ec SHA-256: d17da5774310491d312c17ed744d067b47e73b1a784b38f29599600d5a587905
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://seumenha.ru/wix?keyword=bargaining+for+advantage+negotiation+strategies+for+reasonable+pdf PDF link annotation
    • https://cdn.sqhk.co/raxavetaletu/BicJhfK/393_number_in_words.pdfIn PDF document text
    • https://jafipununevov.weebly.com/uploads/1/3/0/8/130814040/7956150.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/jozagasogu.pdfIn PDF document text
    • https://gupebuxoguwev.weebly.com/uploads/1/3/4/3/134381402/dunugujawod_vigenoxef_fakijilufalefub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461205/normal_5ff3e2184dcf6.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuzemabad/2YQgFid/dabeda.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/ehegchf/fojexadoviwixis.pdfIn PDF document text
    • https://mokomowu.weebly.com/uploads/1/3/5/9/135969792/4533649.pdfIn PDF document text
    • https://cdn.sqhk.co/purilusevike/hFjhqTJ/pogerorovifale.pdfIn PDF document text
    • https://cdn.sqhk.co/lusimalifa/Mgh27MM/.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459029/normal_5fc6b3f91a82f.pdfIn PDF document text
    • https://cdn.sqhk.co/regisanozoxo/hm4icKk/itunes_country_music_charts_ireland.pdfIn PDF document text
    • https://kekageguva.weebly.com/uploads/1/3/0/7/130776826/4719093.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxejelun/L2hfCHi/bubble_shooter_hack_version_mod_apk.pdfIn PDF document text
    • https://vaturelola.weebly.com/uploads/1/3/4/7/134704713/3943913.pdfIn PDF document text
    • https://vadopesi.weebly.com/uploads/1/3/0/7/130738994/kajomexesewalis-xofoketup-gipuguzowinuwi.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/x1WiebO/todd_rundgren_i_saw_the_light_tab.pdfIn PDF document text
    • https://cdn.sqhk.co/bonosexov/hjctC5A/52745439488.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369788/normal_5ff5c580227d7.pdfIn PDF document text
    • https://sunutefe.weebly.com/uploads/1/3/5/3/135350425/6980711.pdfIn PDF document text
    • https://wuwosafojopog.weebly.com/uploads/1/3/1/4/131407683/datosebitivuxavo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 5248 bytes
SHA-256: b9088d853102b923f3975769008cde4580455fc2a3594a0f92433ec78333a01f
font_01_sfnt_off000104e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E4 12392 bytes
SHA-256: df709efa4022685afe582fd6e6dbe724d9c136626a2d79635f68b6017e69c210
font_02_sfnt_off00012da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361