Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fe5785314a6710…

MALICIOUS

PDF

79.7 KB Created: 2021-03-05 11:27:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0afef894a0afdf975cd49984b052b9bd SHA-1: 276c60dccd9fa178aeb653583c02509a4ee31245 SHA-256: b8fe5785314a6710915dc93014b8deababdce6e8a4d15306622066dd7a5bc53c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' containing 30 external links. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/award?keyword=do+you+lose+weight+being+vegetarian
    • https://cdn-cms.f-static.net/uploads/4410976/normal_5fe6dd848f0ea.pdf
    • http://xozonline.ru/monster_inc_2_charactersik2uc.pdf
    • https://cdn-cms.f-static.net/uploads/4379851/normal_601619785a66f.pdf
    • http://busforpay.online/subtenant_contract_templatej4edl.pdf
    • https://cdn.sqhk.co/vuzefegevo/QoFe5ji/marevun.pdf
    • https://cdn-cms.f-static.net/uploads/4427504/normal_5fe63992b63cc.pdf
    • http://steblin.pro/39450663512mshdc.pdf
    • http://leadtop.co/35325150298ngag6.pdf
    • https://cdn-cms.f-static.net/uploads/4381082/normal_603ea9ea0dc7f.pdf
    • https://cdn.sqhk.co/gixotagokezu/VjfPW8V/space_explorer_4d_puzzle.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/varolexexus/36698709061.pdf
    • https://s3.amazonaws.com/lekelepowo/2782969206.pdf
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_6359e55406be48b887e1ce4df74c30e1.pdf?index=true
    • https://s3.amazonaws.com/zolerazowubow/xazomijovimifawonorokudi.pdf
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_7fff982e6696450a83d8be7e014afcc9.pdf?index=true
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_5cb733175f93460bbc30d61219566ad6.pdf?index=true
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_dc6c9daa738a4580a30ba8cc0f908afb.pdf?index=true
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_300349967047426d9b34a6d0249fb8c6.pdf?index=true
    • https://s3.amazonaws.com/vovuzize/97028526858.pdf
    • https://s3.amazonaws.com/makumapikeze/kufimamojurag.pdf
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_b56d24ededaa46d98a4abd072cc8b400.pdf?index=true
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_bac44b6fbaad4ce8beed617e5de85052.pdf?index=true
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_46fa7909af9542c6adb4fe771e4c7ac6.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa72.bin
8827588ee553f86edcf024d3a0dff64313fc62d5a11f316c6bd9a1e83be04047		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 5340 bytes
font_01_sfnt_off00010cbb.bin
f79667212ddeb53def1961a7eb472e62e56ebb5984ec8898e0df4019a17eabf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBB 10660 bytes

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