Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc03b0123919b93…

MALICIOUS

PDF

71.2 KB Created: 2021-03-22 22:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: dc9bc8b7097592fb9ba938177b36d27c SHA-1: 3d288a0821fb5cdf492cb64ac34db1cf09a52968 SHA-256: 1bc03b0123919b93b3c1d6947f49754c0681e3a8bf9b584bbfae007617ea543d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/award?keyword=barrenas+de+perforacion+pdf PDF link annotation
    • http://takovevagagiv.scienceontheweb.net/advantages_and_disadvantages_of_sole_proprietorship_partnership_and_corporation.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/ahgjhhe/sowogizif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411481/normal_5feb1ee9bf70f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388620/normal_5fdd5c95792d4.pdfIn PDF document text
    • https://cdn.sqhk.co/lusimalifa/icjHgcS/injustice_2_mobile_character_list.pdfIn PDF document text
    • https://cdn.sqhk.co/xuteposidobi/BjcXhix/ripowofok.pdfIn PDF document text
    • http://strahuemsya.info/8342396599go14j.pdfIn PDF document text
    • https://cdn.sqhk.co/mepawoworu/iejgrhf/26434277892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448750/normal_6041f16ea3362.pdfIn PDF document text
    • http://habercigo.com/lakegorolubozesafagagijkx58q.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/gibjcjc/1.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/84407891330.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403684/normal_5fe19c09c0dcc.pdfIn PDF document text
    • http://pollsexpert.com/vazatonukt0mlz.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
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_c5932c27c8524c6fa417247b259ba38d.pdf?index=trueIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_cc082f822b89457d8a682a5df0f1f080.pdf?index=trueIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_00d5e0b6ae774ef6910845b8d05e4b85.pdf?index=trueIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_0bb344df69e34310ab0835382a46aee7.pdf?index=trueIn 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_off0000cad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD8 4876 bytes
SHA-256: 20efbdb67cf10de5202462fb6dd9ce2b8acec55b24bc42bab6503a3dd3e21a5e
font_01_sfnt_off0000db69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB69 11096 bytes
SHA-256: c778dc3da24bc3f0142ae1a0acf47806bcbdf2279437f954cbca0c06170635c8
font_02_sfnt_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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