Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7ece9b5dfa805f…

MALICIOUS

PDF

72.5 KB Created: 2020-12-15 14:06:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9973e8bc19f42386142192595afb7ec8 SHA-1: c17f1cba1839c703ae02d26d05ec1f5c6ff632e7 SHA-256: 8b7ece9b5dfa805f41f34629ffca217d40403aab1f71d616b447ae0620d0f735
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be a lure for users to click these links, potentially leading to phishing sites or further malware.

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/123?utm_term=deacon+chairman+planning+guide PDF link annotation
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/dbbd04.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/pewiredegaka.pdfIn PDF document text
    • https://kakawugob.weebly.com/uploads/1/3/0/9/130969990/9555012.pdfIn PDF document text
    • https://fipoxojumudex.weebly.com/uploads/1/3/4/6/134649093/jubuvogalox_kojakomeb_vejosavazejujo.pdfIn PDF document text
    • https://vodeveta.weebly.com/uploads/1/3/4/6/134611656/2359f65613bab8d.pdfIn PDF document text
    • https://gowubezu.weebly.com/uploads/1/3/4/4/134497845/2429827.pdfIn PDF document text
    • https://mofalapew.weebly.com/uploads/1/3/4/3/134307760/6897112.pdfIn PDF document text
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/banolu_bosafuvot.pdfIn PDF document text
    • https://sagotudiwesuw.weebly.com/uploads/1/3/4/3/134340488/zajimefenabibo_werif.pdfIn PDF document text
    • https://tezugigawezen.weebly.com/uploads/1/3/4/8/134878192/rodizamir_sejakeb.pdfIn PDF document text
    • https://wiwanozamo.weebly.com/uploads/1/3/4/3/134306351/c1eeffa4.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/4ab41db2-e633-49dc-a54c-538968db00c5/rogomikugaramuruvojufaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56c64f7b-8122-427c-88be-e4e33ff54f73/mogofebaxerawujulevikaw.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_off0000d07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07B 5108 bytes
SHA-256: 6ffb70522621ede11fe668186210a923bb7160f467bff08657070ac706232540
font_01_sfnt_off0000e199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 10900 bytes
SHA-256: ec15fa7365e6ff970a477a0711c089f484625ade758c48b55a9a6d7ddacd680e
font_02_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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