Malicious PDF — malware analysis report

Static analysis result for SHA-256 89099b5d5f211e8e…

MALICIOUS

PDF

85.0 KB Created: 2021-05-27 08:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8e2e87c7bb804f430892402562b4d6af SHA-1: 14701fae1a19507c7ff1f96301e41b03b824a740 SHA-256: 89099b5d5f211e8e32dff635fcd851806816a6a893406340951e626e13624acc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm with 30 external links, many of which are SEO-optimized and hosted on disposable domains. The primary URL, disguised as a movie search result, likely leads to a phishing or malware distribution site. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/strik?utm_term=spider+man+2+full+movie+in+hindi+dubbed+youtube PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424331/normal_6067cbbad311d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5fd85c820abb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370299/normal_5ffb5f2e54fa8.pdfIn PDF document text
    • https://vuxerapetu.weebly.com/uploads/1/3/4/5/134599288/bizaxi_zujobali_xisetixim_damiwobasiduko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403818/normal_60170b534e3fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443819/normal_5ff1cabd3cf33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369781/normal_5ffa349442806.pdfIn PDF document text
    • https://xuposebifaperep.weebly.com/uploads/1/3/4/6/134673232/xofoditaf-vanidakixutexev-donaxovo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450896/normal_6001474a2709b.pdfIn PDF document text
    • https://ferosikapomizud.weebly.com/uploads/1/3/4/5/134526037/relodobomatut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475212/normal_5ff3e82ad9989.pdfIn PDF document text
    • https://lugarulanug.weebly.com/uploads/1/3/5/3/135383187/ee0b362d8f51402.pdfIn PDF document text
    • https://siravexadobema.weebly.com/uploads/1/3/4/3/134320718/waxidiru_digaz_vitukaxulipob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412165/normal_5ffdfc4cca71f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403560/normal_601d103650762.pdfIn PDF document text
    • https://bekajujoxofutit.weebly.com/uploads/1/3/1/4/131406668/winuxapuw_minuvew_bedamazofa_nelumuxitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489241/normal_605c60d960df4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498376/normal_6047ca5260a1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475559/normal_6031c04266f5f.pdfIn PDF document text
    • https://wemoloxemud.weebly.com/uploads/1/3/4/6/134603697/3897037.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408355/normal_5fe51a5ec9e88.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/a635538b-b243-4375-b71c-1cb5d4423367/robert_jordan_the_dragon_reborn_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ff8c7a-b672-4cb3-bf60-7d2885dae2cc/my_tom_2_mod_apk_2.4.0.544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf7305bd-d19e-4834-8b2d-1a3d5292fe4f/pillars_of_the_earth_book_2_achievement_guide.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_off00010241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10241 5640 bytes
SHA-256: d586f73d31a794e4a6070f8de77c2b0f4e66b597d3e75ecd2a43fde51be5ae89
font_01_sfnt_off00011544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11544 1948 bytes
SHA-256: d4c28e351106b485bb452b8c3d52ae4032fb34fffb029db96304f01691da906c
font_02_sfnt_off00011e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E95 11472 bytes
SHA-256: 4dd161558854fbff0247e49d852b2a58a90d7a201182e24389c02ca4855a4332

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