Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68ed20bbda2ad95…

MALICIOUS

PDF

67.3 KB Created: 2021-06-12 13:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b4c582b037cfb44b9b5ddb8f08a88548 SHA-1: cbf6585b6bb599f0247ca8971c425d70390c354a SHA-256: f68ed20bbda2ad95fd17ccc6914713756c71a48c8fe6e5d9aaf71dd02bb40f01
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. The embedded URL `https://inwebjor.ru/pbw?utm_term=goblin+stay+with+me+piano+notes` is a primary indicator of malicious intent, likely leading to a phishing or malware distribution site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by `wkhtmltopdf`, a tool sometimes used to create malicious PDFs.

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 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://inwebjor.ru/pbw?utm_term=goblin+stay+with+me+piano+notes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418973/normal_604223f93d4cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464301/normal_602effa42dee8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461791/normal_5fc7b466e4ab1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473642/normal_6031dfab77c77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454049/normal_60ba644a2ecc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_603caaa830146.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/055a8ee0-ff30-47d4-b8e0-e3c06d39eb41/diary_of_a_wimpy_kid_15_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cabd0e4b-65fa-4320-adca-0200b8cb79b4/38728253151.pdfIn PDF document text
    • http://xemeganavon.pbworks.com/f/vatab.pdfIn PDF document text
    • http://negaboxa.pbworks.com/f/47073357034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f15fbba-1059-41a9-89c2-bd7bcf1e85d0/lutopagoketalipozoperiwiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c337c3be-1087-4dbc-a1b7-2d0a83a90fc0/78214461217.pdfIn PDF document text
    • http://vawijoj.pbworks.com/w/file/fetch/144625914/north_carolina_state_board_of_education_policy_manual_code_of_ethics.pdfIn PDF document text
    • http://godekazonigi.pbworks.com/w/file/fetch/145159380/bebinizipitifur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a7d71d-c9b6-4497-9c49-23955f39972e/what_does_j_c_b_stand_for.pdfIn PDF document text
    • http://tefimemovem.pbworks.com/f/avner_pediatric_nephrology_7th_edition.pdfIn PDF document text
    • http://wixugigir.pbworks.com/f/91803279892.pdfIn PDF document text
    • http://tesesazef.pbworks.com/w/file/fetch/144875265/wunanijoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1090b03c-d7b7-4695-b82a-a1e91e3688bc/allister_access_3500_garage_door_opener_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5b3adb8-fab1-4e7d-bf7d-50d4f69e8929/what_is_meant_by_canon_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d5a4f64-c7e7-4130-baf5-c9920d370174/mifikino.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_off0000c725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC725 5328 bytes
SHA-256: 9115df7410e70ea541a35934d32cd5eb9ec38d43b2fdf054bb51396c3bd434a4
font_01_sfnt_off0000d938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 10904 bytes
SHA-256: a05050ab793c26bf2943ec2625e1777371390574b85e0946eb14306e5b0a6721

Open this report in the interactive analyzer, or submit your own file for analysis.