Malicious PDF — malware analysis report

Static analysis result for SHA-256 823dfa0276573a65…

MALICIOUS

PDF

83.6 KB Created: 2021-06-08 07:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: aa55eff5d368939e8114043a34ed1276 SHA-1: 699ee60edd6cc750f67b33766e0c7189416c6011 SHA-256: 823dfa0276573a65c4bfd9ce813554e41f9af5cd4a347a9558e4dbff0f957c58
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified as a link farm. The primary URL, 'https://chcial.ru/pbw?utm_term=zdzislaw+beksinski+pictures', suggests a potential lure related to art images, possibly to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or SEO manipulation.

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://chcial.ru/pbw?utm_term=zdzislaw+beksinski+pictures PDF link annotation
    • https://fefedajukuda.weebly.com/uploads/1/3/1/0/131070841/wotegus.pdfIn PDF document text
    • https://jonolepazom.weebly.com/uploads/1/3/4/5/134520471/6615061.pdfIn PDF document text
    • https://xipumimetadefol.weebly.com/uploads/1/3/4/3/134358687/705f35cfb812545.pdfIn PDF document text
    • https://nudimulax.weebly.com/uploads/1/3/6/0/136010194/9274bba88.pdfIn PDF document text
    • https://samaruwopag.weebly.com/uploads/1/3/0/7/130738554/2216b4c699.pdfIn PDF document text
    • https://weroxodadugofu.weebly.com/uploads/1/3/4/5/134503620/dakosixiwen_napatede_mopuginuvuzojek.pdfIn PDF document text
    • https://zadefiwexosufe.weebly.com/uploads/1/3/4/6/134634331/5d7eebc6ced.pdfIn PDF document text
    • https://bewarovawizijus.weebly.com/uploads/1/3/4/4/134454629/purekexoxonu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/22562504849.pdfIn PDF document text
    • http://lipovosufuk.pbworks.com/f/77425942947.pdfIn PDF document text
    • http://jowenoxo.pbworks.com/w/file/fetch/144549942/how_to_use_loops_and_threads_knitting_machine.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/w/file/fetch/144575799/how_to_adjust_a_water_heater_temperature.pdfIn PDF document text
    • http://guvevef.pbworks.com/f/is_the_reid_technique_effective.pdfIn PDF document text
    • http://fetinaduv.pbworks.com/w/file/fetch/144685158/3303917300.pdfIn PDF document text
    • http://gonumutat.pbworks.com/f/gikavuzozodikotiwaseseb.pdfIn PDF document text
    • http://kakewizajupe.pbworks.com/w/file/fetch/144745989/nasibomupam.pdfIn PDF document text
    • http://gazumadu.pbworks.com/f/fegirunevekefolo.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/144646905/circumference_of_a_circle_worksheet_7th_grade_answer_key.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_off00010597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10597 5368 bytes
SHA-256: 4af644f5c3b43cbc244a41fc771d9dabcf0fb2868efd3aaa1dca559474bf589c
font_01_sfnt_off00011803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11803 12584 bytes
SHA-256: 8edbbd6adde4f0a9184fab5b3ca86c9c1d3d06a46848ebfd9a5de62a1f3eca6e

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