Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf58ae02a1003293…

MALICIOUS

PDF

140.8 KB Created: 2021-06-13 02:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: da4af8751f935ef3839e342f7ae98351 SHA-1: d3d1ef0e950483b1632ff7f1be47e964656184db SHA-256: bf58ae02a1003293195cfa2d2c623f9668c94285a90ade8260bd46036faca2ca
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, appears to be a lure related to 'Assassination Classroom episode 8 vostfr' to drive traffic to these external sites. No scripts were extracted, but the PDF structure and link farm heuristics indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://garglob.ru/pbw?utm_term=assassination+classroom+episode+8+vostfr PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380536/normal_6052c353be541.pdfIn PDF document text
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/c1644ae7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473410/normal_6023d34a59480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504641/normal_6068a78277059.pdfIn PDF document text
    • https://wirukerig.weebly.com/uploads/1/3/4/6/134630703/tikekuxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451754/normal_606e925e4e84e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463264/normal_6066e4cb6ee3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380237/normal_60038faeef47e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451971/normal_60300927dc060.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366063/normal_6008f81fd2669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447434/normal_600ff694aebce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445320/normal_5fdc6e133539d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4417325/normal_60b30613c9613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476126/normal_60c2a2cb32569.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483870/normal_6038e4e6af573.pdfIn PDF document text
    • https://lerekisisag.weebly.com/uploads/1/3/1/4/131408666/vobuv.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
    • http://fokurid.pbworks.com/w/file/fetch/144766509/lokafuzosoxi.pdfIn PDF document text
    • http://lowigamivux.pbworks.com/f/90388843828.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144614892/wimogikigukigutovavopof.pdfIn PDF document text
    • http://zekodunu.pbworks.com/f/xekudekivesesaxiliwet.pdfIn PDF document text
    • http://deburajuza.pbworks.com/w/file/fetch/145172382/20094859649.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C85 13560 bytes
SHA-256: a1799e41380889cd03d7c0ee492247bd5a7aeda0302b7764bcfbcf17c0560694
font_01_sfnt_off0001b8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8F6 5332 bytes
SHA-256: 5eb6daff2192fee6a7dc4b6cce5f8d067db46c9dbb5ce6bb1881998fa9392f3c
font_02_sfnt_off0001cafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAFC 16144 bytes
SHA-256: e99fb92c73bb0a06f1a0c159eb252d598284d86640ef09b92fdffa8866d5b80d
font_03_sfnt_off0001fc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC3D 16900 bytes
SHA-256: 7557b02b892914dbb766c71cbaffe14be5aec5ac88bfda6489e2e40f32793805
font_04_sfnt_off00021465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21465 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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