Malicious PDF — malware analysis report

Static analysis result for SHA-256 853a4035b2485f39…

MALICIOUS

PDF

71.0 KB Created: 2021-03-06 09:59:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f5ab49caa9f4695600350c1f912bdc8e SHA-1: 7ece556fefcb6ac4cfa694d9ea531edee171fd0f SHA-256: 853a4035b2485f39f8396bf5fe95e844b2bffd24900ee1d40c7845fd73a3e586
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The presence of external URIs suggests an attempt to redirect the user to a malicious site, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://xajibur.ru/award?keyword=craftsman+12+gallon+wet+dry+vac+accessories PDF link annotation
    • http://tiwujatujoput.mygamesonline.org/excel_formula_multiply_multiple_cells.pdfIn PDF document text
    • http://segwaywheelchair.ru/phoropter_parts_and_functionvcvg2.pdfIn PDF document text
    • http://kexedeziferu.sportsontheweb.net/duzagizixewusurufap.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/94754409123.pdfIn PDF document text
    • http://smartradiobf.ru/movagowinunmmzq.pdfIn PDF document text
    • http://jepizilodabisop.iblogger.org/vukaxevujowawijimutem.pdfIn PDF document text
    • http://likefetevu.getenjoyment.net/96613758591.pdfIn PDF document text
    • http://rozogididibusar.sportsontheweb.net/puwiwuzaxogavatezanidi.pdfIn PDF document text
    • http://dvestideyli.xyz/11254148802t6wve.pdfIn PDF document text
    • http://harmony-market.ru/alcohol_phenol_and_ether_notesvldlp.pdfIn PDF document text
    • http://vexezujuzas.scienceontheweb.net/42796075788.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/how_to_treat_cystic_acne_fast.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
    • https://uploads.strikinglycdn.com/files/01f9f184-408c-453c-93ac-c8936b427ff6/how_to_pair_rca_universal_remote_to_sony_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c05dae48-bf05-466a-a529-daf169d019ac/70146017125.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/93270966986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0280662f-37b5-4e08-b039-ce00d8afdc6d/emotions_wheel_printable.pdfIn PDF document text
    • http://vowipinarofesax.epizy.com/auto_mechanic_helper_jobs_near_me.pdfIn PDF document text
    • http://rexerutagid.epizy.com/operating_system_for_gaming_pc_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96835c08-1212-4ff5-bffc-e84cd2c725e6/shakespeare_sonnet_73_interpretation.pdfIn PDF document text
    • http://zadedasex.epizy.com/97361408795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99ffb7f6-2699-4868-836b-3dae4452716b/die_kleine_raupe_nimmersatt_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB9 5592 bytes
SHA-256: 31aca0f3f14e4ad967f427b5a0fcce7c3addfe8ef4a5f4dd206e4edb6ba617f6
font_01_sfnt_off0000dec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC9 9816 bytes
SHA-256: 2e73e9324e8c43c5fc320743d8e3239356166bd7a0f20cf84dfffff19d8c6595
font_02_sfnt_off00010050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10050 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

Open this report in the interactive analyzer, or submit your own file for analysis.