Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd263ef2891622f8…

MALICIOUS

PDF

87.9 KB Created: 2021-02-07 19:47:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: eb6a8b3b404c2cad29a7fbaee70b5f9e SHA-1: feaffd553d5cac4cf7023af204324ad7dd312e33 SHA-256: bd263ef2891622f8adf96bf6eda79f194333cc51b1ac923968e8cc39ac141a95
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'Asiandate hack apk' and the authoring application 'wkhtmltopdf', further supporting a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/wb?keyword=asiandate%20hack%20apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457590/normal_5ff58dd020e68.pdfIn PDF document text
    • http://scrlt.xyz/17611575720ffpqm.pdfIn PDF document text
    • https://vovavurag.weebly.com/uploads/1/3/0/7/130739927/1531556.pdfIn PDF document text
    • http://mestorating.ru/fafilinaguderusedibilodangr5ax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_601797087e43e.pdfIn PDF document text
    • http://storeeu.info/38497640439ybfr7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477615/normal_5ff65ec365d02.pdfIn PDF document text
    • https://jizojalagakamu.weebly.com/uploads/1/3/4/8/134886497/morawofumo.pdfIn PDF document text
    • http://sadovik.me/dibikor2x1k.pdfIn PDF document text
    • https://venolebibu.weebly.com/uploads/1/3/5/3/135348563/wosidudazovafebimef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367922/normal_600530e14af0b.pdfIn PDF document text
    • https://zexexidiwe.weebly.com/uploads/1/3/5/3/135330220/d5f4b92105b4a.pdfIn PDF document text
    • https://tesegape.weebly.com/uploads/1/3/5/3/135387632/ximunedexepufafatom.pdfIn PDF document text
    • https://doxediseweroz.weebly.com/uploads/1/3/4/6/134634010/gojivetizabawukitumo.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/xafaxotaful/dihybrid_crosses_practice_problems_worksheet_answer_key.pdfIn PDF document text
    • http://logedulon.epizy.com/houghton_mifflin_english_grade_6_answer_key.pdfIn PDF document text
    • http://fokoxowikelejex.rf.gd/35285403548.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000df44.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDF44 7936 bytes
SHA-256: 34b17247b28dbcb417028bacbbcfe18ccea3c3a9c410fe9b924e1487bc01add1
font_01_sfnt_off0000fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 5084 bytes
SHA-256: abc9ca2ce55071542fe81cd930ae53d8ea3477654cb11ab0ec469a7298e90aac
font_02_sfnt_off00010b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6E 2320 bytes
SHA-256: 2c8b6420b6d87b7f7ab5f6d39477eb07879f4c65ea05a123231bd55f3df40664
font_03_sfnt_off000115cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CF 10916 bytes
SHA-256: 0d3a53bcded2d3431063e0ee1bec78bbf6612536eff7ad1f8f9583945749c00c
font_04_sfnt_off00013b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5E 16308 bytes
SHA-256: 89e0c36e020214ad754d9179a0bc54b7d22eaa05474816ea7f5118a510f4b353

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