Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c4c6c0fd4bb6cd…

MALICIOUS

PDF

77.1 KB Created: 2021-02-12 07:16:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 49063fca9da5bedc59b114403a6cf7a6 SHA-1: 90acd883c03aa34f18c89339a9a6966a278d9184 SHA-256: f4c4c6c0fd4bb6cdbd7584d43de40d6db3b77513a8a18cf1afac290a44509ecb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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://leonvi.ru/123?utm_term=spalding+52+basketball+hoop+instructions PDF link annotation
    • https://lozofedexipa.weebly.com/uploads/1/3/5/9/135969573/wedip.pdfIn PDF document text
    • http://sethel.xyz/pokemon_quest_evolution_chartqjutg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376598/normal_5ffca73f4c901.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382779/normal_600191a0d220c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386830/normal_5fca3b0d53f7e.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/egdha3h/pimetavujigode.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/gdjhZhc/masters_in_engineering.pdfIn PDF document text
    • https://dosoxeluniwipeg.weebly.com/uploads/1/3/3/9/133997743/fomewosabix-novopemutaje-pawokegoze.pdfIn PDF document text
    • https://kojazuzok.weebly.com/uploads/1/3/1/4/131438397/5009923.pdfIn PDF document text
    • http://gordei2d.com/capitec_app_for_pc_freekh9z0.pdfIn PDF document text
    • https://cdn.sqhk.co/dedejosewor/uBgcG9c/virtual_families_lite_2_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/DgfcZI0/jersey_movie_amazon_prime.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411480/normal_5fcb785c74d4c.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/dIB7gj7/uk_radio_online_free_listen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/safago/bhole_bhandari_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/10508915822.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17D 5896 bytes
SHA-256: e14528885b9a23d84ff8b3286e16d54eac950b66c6429eb176de9ccf167c49c7
font_01_sfnt_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 10288 bytes
SHA-256: 4135e14178317a4fc5958516867561f4b40d8f783804150a8248b326db82cc40
font_02_sfnt_off000108e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E9 9156 bytes
SHA-256: 1200e93c619e6a97437435790c5f6fc23adaaaebd5e7ffa7eed8aec9ce9bea87

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