Malicious PDF — malware analysis report

Static analysis result for SHA-256 423bf1b19c9a11c1…

MALICIOUS

PDF

70.3 KB Created: 2020-12-15 15:36:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e8fba4664375773b025bf2a1c75d34e8 SHA-1: d997c39cb302562d60e7effc44fa6d1b883fc63c SHA-256: 423bf1b19c9a11c178542c219dc30079bb2d6d8b94275e548c1855f1ddb3d5e2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://traffking.ru/aws?utm_term=adobe+photoshop++for+windows+7.+0 PDF link annotation
    • https://fonevufaj.weebly.com/uploads/1/3/4/4/134444269/6389430.pdfIn PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/e4f9439fd5b50c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450038/normal_5fa664e235cc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_5f9fc2f2e2f29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387235/normal_5fcc99ff99e2f.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/4841239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376854/normal_5fa5899f98544.pdfIn PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/9941965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372696/normal_5f988bfc3b3f9.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/709f0839-69a6-4e3a-b521-103b92f26e2c/gixemugimidirumeza.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4f91fa3bf4b14abc32683/t/5fc6791bf8cdb769c6c35ef6/1606842651773/honda_gx_engine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0f38f45-818b-4488-afba-c71b27e4bd3d/rasutasusefofavoguguki.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9D 5148 bytes
SHA-256: f6a582e5d80a2db923087944addd860e75f829aa406a594dddb043f6b7bc867c
font_01_sfnt_off0000dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 10000 bytes
SHA-256: a22d0d369a79f9e0154edaa4d8497adbc0cf86e8f557ce11bd101788f04fbb32
font_02_sfnt_off0000fe79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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