Malicious PDF — malware analysis report

Static analysis result for SHA-256 c496081d0bcd7669…

MALICIOUS

PDF

78.3 KB Created: 2021-01-08 17:37:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 97fbbff1110ce6e2b422b94ee6a55657 SHA-1: 856058bf4d84532aa1e2e9a48e88b0434399dede SHA-256: c496081d0bcd76692ef4c0c48d7f513abddde5f6d435c474ebaaefe69018263e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this. While no scripts were explicitly extracted, the nature of the link farm and the ML detection suggest it may be used to redirect users to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafficel.ru/aws?utm_term=flower+brushes+illustrator+free PDF link annotation
    • https://cdn.sqhk.co/vetedaxuzele/jvhcbKf/carpentry_classes_for_high_school_students.pdfIn PDF document text
    • https://cdn.sqhk.co/pakiwujipubi/dhbggpk/larabafotolunagavakujofo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_5fa5998ab05ef.pdfIn PDF document text
    • https://joletumutete.weebly.com/uploads/1/3/4/8/134871701/2949730.pdfIn PDF document text
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/9759735.pdfIn PDF document text
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/wimexubul-nedexukuk-zuxefudofoso.pdfIn PDF document text
    • https://cdn.sqhk.co/bidelefo/eDJDfjc/download_game_battle_cube_dungeon.pdfIn PDF document text
    • https://guvemixekowarov.weebly.com/uploads/1/3/4/6/134686109/88639.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/2HlrhgH/vavukexisuwidexazo.pdfIn PDF document text
    • https://kawijidaxo.weebly.com/uploads/1/3/4/8/134891868/vovexavijumumo.pdfIn PDF document text
    • https://cdn.sqhk.co/ladetozuxi/XJrgFJ2/beast_battle_simulator_free_download_pc.pdfIn PDF document text
    • https://lupabarudu.weebly.com/uploads/1/3/1/3/131398308/6ad6f4e4c6f.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/7whi6D3/lyrical_songs_for_dance_solos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443576/normal_5fc2c2f49468f.pdfIn PDF document text
    • https://cdn.sqhk.co/difanemifal/drJjjbT/dj_sound_effects_2019.pdfIn PDF document text
    • https://fanarise.weebly.com/uploads/1/3/4/3/134377412/88a496.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/vufuzewasi/panic_room_nightcore.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_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 5044 bytes
SHA-256: 530414f2b57f1e5302cd958f70add1d4556a41124521256468ead6ac0a37a8d2
font_01_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 10656 bytes
SHA-256: d75422290047b5c28cf46c076817c798e5e61e46a67d9a319e54ce04abe10377

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