Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24e7f18dc1661af…

MALICIOUS

PDF

71.7 KB Created: 2021-04-07 08:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b8d53b95a0025018c37c369233fa9987 SHA-1: 5d97412e7b1e76c28affbe43134b3adf7f293185 SHA-256: f24e7f18dc1661af741ad2d45884b1d6bfed27caa440c4b06cef8d3739494e17
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. Several of these URLs are hosted on disposable domains, and one is specifically flagged as a potential phishing or malware distribution point. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites via the embedded links.

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://xezojetit.ru/award?keyword=daun+belimbing+wuluh+pdf PDF link annotation
    • https://puzejiwitamino.weebly.com/uploads/1/3/1/4/131453698/9bad852f08cb.pdfIn PDF document text
    • http://zuzumolimisugu.22web.org/long_island_railroad_schedule_and_prices.pdfIn PDF document text
    • https://gosalojuwik.weebly.com/uploads/1/3/6/0/136050429/wabudoku.pdfIn PDF document text
    • http://makasef.22web.org/pazomivaboribizavipimugu.pdfIn PDF document text
    • http://liseravuziw.22web.org/dnd_5e_escape_restrained.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/pogolo/83900638323.pdfIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_01325c2a9f444cc7b03c37053c9fe5c2.pdf?index=trueIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_5d60a0d6e5594381ad5a0eef910592f4.pdf?index=trueIn PDF document text
    • http://limidiladafa.epizy.com/manol.pdfIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_0b6e36fd4f9c4a1aa7891a092f81ca06.pdf?index=trueIn PDF document text
    • http://wovitoted.epizy.com/kutty_movies_2016_tamil.pdfIn PDF document text
    • http://bapaxofobawob.rf.gd/mapejutojevodivupu.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/ge_profile_microwave_fan_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/37659786677.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/56245313428.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_10f06d99823a49bbb43a78bedc671b0f.pdf?index=trueIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_5b63ad4aa508470daa9e982ab51b7b20.pdf?index=trueIn PDF document text
    • http://bijupota.epizy.com/arris_dg860a_login.pdfIn PDF document text
    • http://jotowit.rf.gd/how_to_check_voicemail_on_mitel_5312_ip_phone.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_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 5412 bytes
SHA-256: 9816fafd3e965321389c30f3e2702a1aa88a3bcddfe3399ff9bc1602132a68d7
font_01_sfnt_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 9752 bytes
SHA-256: ba8dde23509386d8d68c667654f74f8d1865ce4f859a441b987af2de2126f4ae

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