Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b901a6548354a7…

MALICIOUS

PDF

70.0 KB Created: 2021-01-10 12:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0bf7521b713d69d3e8da22c2b78b01e4 SHA-1: 59f918603ce8c225de51973ba58342f7e2a0e912 SHA-256: 97b901a6548354a767e5aede8559b3e59810dcc949dea8054b1c08ac5d16e17c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, and also detected by ClamAV. It functions as a link farm, containing numerous external URLs pointing to disposable hosting services like Weebly and sqhk.co. The embedded URLs and the PDF structure suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/aws?utm_term=informacion+sobre+vejiga+urinaria+en+ingles PDF link annotation
    • https://dawipufa.weebly.com/uploads/1/3/3/9/133986453/3826160.pdfIn PDF document text
    • https://parukiwodisurup.weebly.com/uploads/1/3/4/4/134455528/9975003.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/jeicvih/dj_mix_pads_2_remix_version_pc.pdfIn PDF document text
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/38cfa74303.pdfIn PDF document text
    • https://valoxapemep.weebly.com/uploads/1/3/4/3/134305175/8cd01886ce093.pdfIn PDF document text
    • https://wozibasibif.weebly.com/uploads/1/3/4/8/134868806/nexedir_batososogile_bugeduluwovuze_jekatoriverizuw.pdfIn PDF document text
    • https://kezevamu.weebly.com/uploads/1/3/4/2/134266298/motovufurabezatati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418399/normal_5fb345d95bf2d.pdfIn PDF document text
    • https://tagebukolili.weebly.com/uploads/1/3/0/7/130776523/viseg.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/ifgdjcp/lumberjack_attack_idle_games.pdfIn PDF document text
    • https://livozuduk.weebly.com/uploads/1/3/4/5/134583284/magexuru.pdfIn PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/3b0aae.pdfIn PDF document text
    • https://leziwave.weebly.com/uploads/1/3/4/4/134446015/tadurazus_veriko.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_off0000d034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 5412 bytes
SHA-256: 4d967999669de14313f9bfde2e73388f62b62c8e64dbed5b0e084916ed7e28eb
font_01_sfnt_off0000e296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE296 12048 bytes
SHA-256: 12a6064f7b2c2e149878c990c9afed9a51d76b11e1e10e92e3c76425afddf870

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