Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccac805749af76a5…

MALICIOUS

PDF

90.1 KB Created: 2021-05-21 19:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 656ea83f7c3a90bb4803b0860a2510dd SHA-1: 1210d16384de021b49f18d6cd22aec3e7721b546 SHA-256: ccac805749af76a5e1e64b71dd53d67cf5da2b15c9de46f1f1cdcf5e7a76f10d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to benign-looking documents, but one prominent link directs to a URL related to game modding. This suggests a phishing or malware distribution attempt, leveraging a seemingly innocuous topic to entice clicks. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the distribution of a phishing payload or a second-stage malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=how+to+install+gta+5+mod+menu+on+ps4 PDF link annotation
    • https://gomamuna.weebly.com/uploads/1/3/5/3/135304292/nowolorojev.pdfIn PDF document text
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/76f4fff6.pdfIn PDF document text
    • https://xogofodaromaf.weebly.com/uploads/1/3/4/3/134387758/7083825.pdfIn PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/5122035.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478146/normal_5fca853c3db8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_601f5f64cd0b3.pdfIn PDF document text
    • https://nolulanulupu.weebly.com/uploads/1/3/1/3/131379612/wejixurutodomavor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483855/normal_600f8d6d9c1c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484114/normal_5fcc0009e4a84.pdfIn PDF document text
    • https://tediresul.weebly.com/uploads/1/3/5/3/135345321/5cc98878.pdfIn PDF document text
    • https://sekawoxovezu.weebly.com/uploads/1/3/4/0/134018239/cef89acb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393026/normal_603a75e932122.pdfIn PDF document text
    • https://jutarufuro.weebly.com/uploads/1/3/0/7/130775772/tesojepodudefuwix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/dart_board_games.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/rmlau_online_registration_form_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2018ab66-f03e-4d52-bfe8-2cf10d0dfd55/how_often_to_replace_vitamix_blade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3d4fb37-4ca4-42be-98a8-77c4a5d14e90/life_of_a_peasant_woman_in_the_middle_ages.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/are_prairie_dogs_good_to_eat.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/93241744734.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/wuxabatapejitotosevo.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/69105222037.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_off00011c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C31 5448 bytes
SHA-256: 804440423ce8caf48fe9d697bed432d8f7e7b557a4911fd0d46e4e2d9d7e1fde
font_01_sfnt_off00012ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC7 13240 bytes
SHA-256: 53938b1b488e36bf803cca7c067cf45178e9c08476f5ac53a6db94cd7efe7baa

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