Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c692867ba13479d…

MALICIOUS

PDF

73.9 KB Created: 2021-03-30 19:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f810a10ca3092039c851d8de0fc0ff2e SHA-1: e31df4ee8043840e7580fa3abbc48720385c884b SHA-256: 8c692867ba13479d6eee213e2116d37af99d52f1b299d25c6893a0b4db2fbfdb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a benign document, masking its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/award?keyword=alphabet+letters+to+print+pdf PDF link annotation
    • https://cdn.sqhk.co/leperanurosi/bkgehMF/39920008793.pdfIn PDF document text
    • http://itprod.space/960246305540j2d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455406/normal_5ff3093a6ecf8.pdfIn PDF document text
    • https://sotivozorome.weebly.com/uploads/1/3/4/7/134733800/degijave_tixirapugowikax_fuxopefeluze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453579/normal_6043955b6ac48.pdfIn PDF document text
    • http://topcreditscore.info/longman_toefl_preparation_testjn5wv.pdfIn PDF document text
    • https://cdn.sqhk.co/gorusuvu/RGlYnzn/44545336878.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/WYKKWmu/48244127641.pdfIn PDF document text
    • https://cdn.sqhk.co/bexuxoxabim/gBpijgc/jotowujofutotifiwujor.pdfIn PDF document text
    • http://dofujifeluradep.medianewsonline.com/technical_words_in_computer_science.pdfIn PDF document text
    • https://xijegubusogo.weebly.com/uploads/1/3/0/7/130739006/tawepivute.pdfIn PDF document text
    • http://itsnat.space/vapugidolw5j4p.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/1o5hhbl/97440816717.pdfIn PDF document text
    • http://voztrans.ru/7th_grade_math_reviewc7tw8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412154/normal_5fe7d05722db1.pdfIn PDF document text
    • http://jsexj.fun/booty_farm_mod_apk_4._145nfl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://masusoxowep.onlinewebshop.net/rumenikadup.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/akkurat_pro_regular_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/tixasur.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_off0000e413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 5256 bytes
SHA-256: c544b55f2ac4351aeec95af734ef1dead3f5f4413eadb4dd9f765c02558bbe88
font_01_sfnt_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 10808 bytes
SHA-256: 7197fa3d77298f9a4140c4ac19653551d38f5eadbf0cb876fd3be7d464d23756

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