Malicious PDF — malware analysis report

Static analysis result for SHA-256 21968cf1cc0139c6…

MALICIOUS

PDF

79.3 KB Created: 2021-04-12 20:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1ef78a50edc7aa423201f8233e05329f SHA-1: 4989939b52229c76a9c1a056a8a6ebf20d21b757 SHA-256: 21968cf1cc0139c69f2d8377fe4e8ae15280724d6153b2fb8d130a8bf1e7b605
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a game guide, likely to trick users into clicking the malicious links.

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://botokaw.ru/strik?utm_term=hoi4+black+ice+soviet+union+guide PDF link annotation
    • https://gojemafofapuvog.weebly.com/uploads/1/3/2/6/132681271/nodurodopul_xexojipuwi_fiwuziwesunodot_goduwebusefo.pdfIn PDF document text
    • http://buvavarosavadar.iblogger.org/jekedanaxupas.pdfIn PDF document text
    • https://tizupokewa.weebly.com/uploads/1/3/4/0/134013062/zebefuxa.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/lazabom.pdfIn PDF document text
    • https://nuxajitavira.weebly.com/uploads/1/3/1/8/131871558/zimataxag.pdfIn PDF document text
    • https://sevakozo.weebly.com/uploads/1/3/4/6/134677934/c9d59de14.pdfIn PDF document text
    • http://zisezamerares.mygamesonline.org/7474917463.pdfIn PDF document text
    • https://tijezelaxupoki.weebly.com/uploads/1/3/5/3/135340387/newivoradobivo.pdfIn PDF document text
    • http://vatologox.iblogger.org/86573053316.pdfIn PDF document text
    • http://lanizimugigil.getenjoyment.net/encyclopedia_britannica_32_book_set.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wumugajus.onlinewebshop.net/insignia_24_inch_fire_tv_review.pdfIn PDF document text
    • http://zevusup.atwebpages.com/tixitiduvuviripufafili.pdfIn PDF document text
    • http://xawiwevivuzox.onlinewebshop.net/benefits_of_studying_abroad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/285b1100-425b-44fe-a8c9-0bb5b017bf0e/aquasource_kitchen_faucet_cartridge_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e22e5b7a-34f2-47c4-b027-ccf9a398031b/can_you_play_2_double_the_rent_cards_in_monopoly_deal.pdfIn PDF document text
    • http://lanutovomet.epizy.com/android_studio_tutorial_tutorialspoint.pdfIn PDF document text
    • http://mizugegixa.epizy.com/prevention_of_occupational_hazards.pdfIn PDF document text
    • http://ramapenutizawa.epizy.com/pradhan_mantri_awas_yojana_application_form_in_kannada.pdfIn PDF document text
    • http://sabarudijavu.epizy.com/62765406158.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_off0000f967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF967 5324 bytes
SHA-256: b0ccb6393e58f3a358ac60faae66a06d27a19a467c6a80ec133074a36f77d550
font_01_sfnt_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 10696 bytes
SHA-256: fc90dc652cb49134d708a6c72c4c370161a6560a0e07ceef4428c97a0e47a90c

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