Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a9c835f19a846c…

MALICIOUS

PDF

70.1 KB Created: 2021-04-01 23:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d0e700a32daa9022e6665dca9c720860 SHA-1: cb437cabc2cc9751a90bff18c2ffcafc54e31000 SHA-256: 70a9c835f19a846c642ba5fef933073f3e168b8ee31724c57e621d8a89bd20c1
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://xajibur.ru/award?keyword=accounting+standards+pdf+file+download. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

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://xajibur.ru/award?keyword=accounting+standards+pdf+file+download PDF link annotation
    • https://zuriloteva.weebly.com/uploads/1/3/4/6/134623588/412c7a.pdfIn PDF document text
    • https://vevikonupefafo.weebly.com/uploads/1/3/5/3/135391347/ginowitofi.pdfIn PDF document text
    • https://betufevu.weebly.com/uploads/1/3/4/0/134098732/zasuwe_dodakuse.pdfIn PDF document text
    • https://pofofeteb.weebly.com/uploads/1/3/2/6/132681268/mavedowumisozetufi.pdfIn PDF document text
    • https://korudodigujoko.weebly.com/uploads/1/3/0/7/130740169/f53b3f5cd3d79.pdfIn PDF document text
    • https://gulijigomun.weebly.com/uploads/1/3/4/3/134350957/03085c95.pdfIn PDF document text
    • https://jizufolikoni.weebly.com/uploads/1/3/4/3/134349493/aeafb89.pdfIn PDF document text
    • https://vamugibamapiju.weebly.com/uploads/1/3/4/5/134588186/2143677.pdfIn PDF document text
    • https://rawoxoduzipuk.weebly.com/uploads/1/3/2/3/132302868/kugusevakulabivifu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pilazi/albion_online_pvp_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e480bf-a27b-4075-bbea-43612d806e48/how_good_is_the_stihl_ms_170_chainsaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6410e3a7-3e9c-4d4d-bf70-351122c4b8d5/energy_elite_soundbar_power_supply.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/rarexos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f30870f6-6204-4287-8cd3-d280ce5d2f0f/10753990531.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3a7a1fd-f475-4fef-a520-03907bc48109/dobosadofor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cebd3fcc-db90-43ab-a891-89ca09f3dbeb/miduk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecdf182f-73a6-4684-b0eb-2c2a4517da8b/who_will_win_2020_astrology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/277755ba-9fbd-4f23-a824-6b706329126a/tozasix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d9f1356-b7a8-472b-a5a2-d7d1230a7e50/sharp_portable_air_conditioner_cv_p10mc_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/177e9a6b-9e97-490f-8b16-f5ba8059fe19/wu_tang_clan_name_generator_reddit.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_off0000d5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C6 5404 bytes
SHA-256: 98c44c6b1760948ebd71169a48ac2494cb4fb8092eb71d108baa33c716462db6
font_01_sfnt_off0000e849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE849 10128 bytes
SHA-256: 519e52c231fd1d943cd7ff779ca1bba1baa6169e860f8f7f87d37dfc43d58a46