Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e8cd171fa910fd…

MALICIOUS

PDF

72.9 KB Created: 2021-02-10 08:00:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1dcf012635f7833857c5fcbf7cf721f7 SHA-1: c6c83454cccca9a35028c3ad6b47c0ab3f61ddad SHA-256: 86e8cd171fa910fd647c8c4a31142fec51507556389737e61b865698d7d3e058
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the ML classifier's high confidence further support its malicious nature, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=neu+garcinia+cambogia+side+effects PDF link annotation
    • https://cdn.sqhk.co/pavujakorige/gSjfjiv/battle_simulator_pokemon_go_pvp.pdfIn PDF document text
    • https://cdn.sqhk.co/koxopumo/5Hgjjjh/11537330952.pdfIn PDF document text
    • http://shtangye.xyz/refenixiviwusamekidakj6940.pdfIn PDF document text
    • http://rawenspant.online/absolute_standards_in_performance_management_systems3vlsa.pdfIn PDF document text
    • https://xajasirofoxuki.weebly.com/uploads/1/3/5/3/135330212/8cdc90447a62.pdfIn PDF document text
    • https://sutopudebesi.weebly.com/uploads/1/3/1/4/131438093/vuvuxisonabotud.pdfIn PDF document text
    • https://fopezifu.weebly.com/uploads/1/3/4/7/134717551/e2652bf7e.pdfIn PDF document text
    • http://dkshlyap.ru/planet_earth_streaming_freew1qwl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465249/normal_5feaf06b97782.pdfIn PDF document text
    • http://efarbok.xyz/hanuman_bhajan_mp3_free_download_gulyqjft.pdfIn PDF document text
    • https://dopovubejaxow.weebly.com/uploads/1/3/4/0/134017692/sovezoragonatar-maxom.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/aaaXJE2/78035622563.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://lafurunun.rf.gd/dafupolajadibaligodix.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_off0000d4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D7 5300 bytes
SHA-256: 4cd7da77831c3ec0445cf6a0a46f06d79abca26aa91119d2dd7f3f42717a2c13
font_01_sfnt_off0000e6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C1 9944 bytes
SHA-256: 42f70fdc9b8408b489dbff7c2270d1defd3d1972db1707577e53188f2ac2ea85
font_02_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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