Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dcc7fe1564126f0…

MALICIOUS

PDF

75.0 KB Created: 2021-04-20 15:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8e2705fcadfc2f5fb7856bd00a5b5177 SHA-1: 25373590ec8938dad5d118e04a0ceeeb14c24258 SHA-256: 3dcc7fe1564126f09c949b64124f0c1498c85c6c821c047a3b7b309736789aa1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting domains, suggesting a phishing or link-farming campaign. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a 'Warcraft 3' guide, likely a lure to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=warcraft+3+frozen+throne+beginners+guide PDF link annotation
    • https://cdn.sqhk.co/mogezunir/KxZicjh/king_crimson_islands_lyrics_meaning.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465123/normal_5fde7a9c1e2d6.pdfIn PDF document text
    • http://megantv.site/4758796006898pkm.pdfIn PDF document text
    • https://cdn.sqhk.co/xivijela/u2heTgf/49306470860.pdfIn PDF document text
    • http://shop-kid-toys.online/5629923172rslcs.pdfIn PDF document text
    • http://trokot-new.online/basic_music_theory_test_questionso7npw.pdfIn PDF document text
    • http://everydays.space/94954739982qwnm.pdfIn PDF document text
    • http://imm-shoes2.club/kairosoft_basketball_club_story_guide56n2o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450509/normal_6029477d1ceae.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/Ighjahi/planet_earth_narrator_morgan_freeman.pdfIn PDF document text
    • http://organic-ita.space/que_significa_desanimo_en_la_bibliadvm2x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448126/normal_606b089e0aafa.pdfIn PDF document text
    • http://euroshopmn.space/70645761584t0qdr.pdfIn PDF document text
    • http://zoomita.fun/groundhog_day_musical_one_day_sheet_musicpk91q.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/yFXphiy/basketball_easy_shooting_drills.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd142474-4a8e-46f5-984e-aad5fd28d1c6/family_feud_online_game_multiplayer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80bc0ed5-90c7-4540-bb0f-cec9ce6f2024/zawiwekiraxidareper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51607aa2-7460-47c6-bea6-08268a504d3b/linux_programming_language_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32b656e7-c5ad-4c4a-a7ef-a9c56933b88d/tafizotofinafov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0671953-8f8f-4718-a3fa-0f31f9516be5/buxarurozivudejusemagona.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_off0000e554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE554 5616 bytes
SHA-256: 91b818b7202e4f31adc06f238bafac9015d7054977c7d46778d8d71162eedb99
font_01_sfnt_off0000f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 10624 bytes
SHA-256: 0f8bfcd0d1a799f1e046ea4b80dd0155dcfb1870ad2cf2d5e742fe8a049cd90f

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