Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d6b8708792a6d8…

MALICIOUS

PDF

78.8 KB Created: 2021-04-04 08:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8bcf44b39aa35a80dcaf71f9f2c55df2 SHA-1: 0aae89de530deb112e7d6d92f4beeaeb93fa256c SHA-256: 55d6b8708792a6d899a4c614db221a6341a0afad12e8fc823f8d9d996dd03eca
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=5e+critical+hit+deck PDF link annotation
    • http://gozebamumu.iblogger.org/strongs_concordance_app_for_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/polopomoset/jgYhd07/classcraft_game_master.pdfIn PDF document text
    • https://cdn.sqhk.co/lasanamemego/jezp61V/rapemusujoludadoretoke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453335/normal_5fc74ccc279f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_60229585e94b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476780/normal_605a942c4c8dd.pdfIn PDF document text
    • https://cdn.sqhk.co/suvezadamut/VCWMiay/18075868137.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/q6zDbih/words_of_twd_fan_trivia_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_604369f01c0c4.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/KRggRNB/watuvupe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423715/normal_5fe1a8bcf00eb.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://jovelinejovadu.epizy.com/spring_framework_download.pdfIn PDF document text
    • http://dimafox.epizy.com/37228978355.pdfIn PDF document text
    • http://bikukasosisado.epizy.com/zovuzabowut.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/girlfriends_guide_to_divorce_season_5_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/wivegu.pdfIn PDF document text
    • http://risitikavaj.rf.gd/esl_describe_a_picture_worksheet.pdfIn PDF document text
    • http://kevawiposiwa.rf.gd/12449438468.pdfIn PDF document text
    • http://vezexosewomex.epizy.com/zipemavefafoniwu.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/what_are_the_new_moons_for_2020.pdfIn PDF document text
    • http://sikofus.epizy.com/youth_worker_job_interview_questions_and_answers.pdfIn PDF document text
    • http://muwalolerede.epizy.com/wiwezufane.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93F 4512 bytes
SHA-256: 2f399cb409b0be3165ce38c5ebdd8f857dec1e528c1baa4f54db847e13a1bfd4
font_01_sfnt_off0000f8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 11544 bytes
SHA-256: d393efe2807401977eed78a6c55d577ee266333c326e0c1383f598b2be06a94e
font_02_sfnt_off00011fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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