Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1dfa2aeb03238c5…

MALICIOUS

PDF

72.1 KB Created: 2020-11-18 14:11:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5f8cb76a63bb71a91b224c5c3f690e2b SHA-1: d88c769a8b083fff9395a4dfbaa0c32a3d4d87b6 SHA-256: c1dfa2aeb03238c5961225c354741d658cdecbf66faa21470ad57385798be354
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-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/strik?utm_term=gasto+volumetrico+formula PDF link annotation
    • https://lugesivewamaxiz.weebly.com/uploads/1/3/4/5/134596289/rugigatubinuko.pdfIn PDF document text
    • https://winimotewo.weebly.com/uploads/1/3/4/5/134593518/8258706.pdfIn PDF document text
    • https://dokojivoko.weebly.com/uploads/1/3/4/3/134395563/07adfb43f9980c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381536/normal_5f97fecabf839.pdfIn PDF document text
    • https://nifufoji.weebly.com/uploads/1/3/4/4/134458522/fc9321.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/c68478389b.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/tiladejonu.pdfIn PDF document text
    • https://mijelowiwiloz.weebly.com/uploads/1/3/1/1/131163856/5105779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5f8df97a49584.pdfIn PDF document text
    • https://jutaxusuwixesel.weebly.com/uploads/1/3/4/6/134678787/zawar.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://s3.amazonaws.com/rorives/backyard_discovery_skyfort_ii_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/install_apk_without_bluestacks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f818262c-630a-4143-91f0-c8561cb7e31d/wutulebepakibediden.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_off0000d0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A9 4896 bytes
SHA-256: e53bb0dc0ddf7cfe263e7aa5e0ddc3e10876882300c58c9074fb98d88d4139ba
font_01_sfnt_off0000e15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15F 10608 bytes
SHA-256: 3e16bc8ed4bf3e42f97045d8e5c367a9c537537394da4919ac31c6b1d3e310d8
font_02_sfnt_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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