Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e2c736e8d03a83…

MALICIOUS

PDF

38.0 KB Created: 2020-11-08 06:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 28901d8ab7b747b503aa556cfaf68268 SHA-1: dd84d890811d91791af034159255cd28ac556f47 SHA-256: a1e2c736e8d03a8385e8400b1b2b331a9e8e20f579bf9b954423f2b947160836
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 1.0000

Heuristics 5

  • 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://traffnew.ru/123?keyword=thit+hun+khoi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383802/normal_5f982d3e2cdd4.pdfIn PDF document text
    • https://zekilunadaxidub.weebly.com/uploads/1/3/4/6/134631079/xaresaxugudon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5f87621487cc6.pdfIn PDF document text
    • https://kuliwulakut.weebly.com/uploads/1/3/4/5/134523122/cea5cfa58.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/759f63b3-5e10-49ca-8858-b66d0bc5e115/punk_o_matic_2.pdfIn PDF document text
    • https://wazewezobe.files.wordpress.com/2020/11/ludedafapigixexez.pdfIn PDF document text
    • https://tevarew.files.wordpress.com/2020/11/88608638079.pdfIn PDF document text
    • https://juvibix.files.wordpress.com/2020/11/gabizagamumarokidatanum.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/92185547724.pdfIn PDF document text
    • https://diwuluj.files.wordpress.com/2020/11/zagesotaxum.pdfIn PDF document text
    • https://nevosaxovib.files.wordpress.com/2020/11/fizimobaruweboratiweti.pdfIn PDF document text
    • https://gudusuk.files.wordpress.com/2020/11/antigone_scene_4_ode_4.pdfIn PDF document text
    • https://mefixogasa.files.wordpress.com/2020/11/c5_corvette_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c01ffcec-58ac-4223-a0c2-6c2260480912/18880345889.pdfIn PDF document text
    • https://ravaxelox.files.wordpress.com/2020/11/4756026122.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/8556479580.pdfIn PDF document text
    • https://tutitogigu.files.wordpress.com/2020/11/adobe_audition_full_crack_kuyhaa.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_off000059b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59B8 4272 bytes
SHA-256: ef64e15603266f0502c0adaaa9c05269337415d6f7ae9cd1b24635402db25810
font_01_sfnt_off00006836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6836 10340 bytes
SHA-256: bf0e11937a3afef2a7f51eeaa4cce191ce22ca016c3085debc61bf28df7c2726

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