Malicious PDF — malware analysis report

Static analysis result for SHA-256 122f46c5d19ba7f6…

MALICIOUS

PDF

74.0 KB Created: 2021-03-11 19:03:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1eb8664d1e713e21637b85a2eb8088fe SHA-1: 18b240b23bc1c2aba289f3da77d160abadf4d940 SHA-256: 122f46c5d19ba7f6f3abdf5de29266f8ec0775efadfd1b9cfdb05bb4d59f2476
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 hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jacksth.ru/wix?keyword=nespresso+machine+manual+citiz PDF link annotation
    • https://wijununag.weebly.com/uploads/1/3/1/4/131438003/e172372425f574.pdfIn PDF document text
    • http://nonowun.mywebcommunity.org/fokuwewedazarisizabufeg.pdfIn PDF document text
    • http://idealica-columbia.site/59792103570vhg7v.pdfIn PDF document text
    • https://xisezuvu.weebly.com/uploads/1/3/4/0/134096300/lupufalotovi.pdfIn PDF document text
    • http://rastet-malysh.ru/15073537286poc1.pdfIn PDF document text
    • http://ig-about.net/sojisaronemer53v7g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/social_work_research_jobs.pdfIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_7ab8e535071c455999e76f606a36bfc1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/wamemujofa.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_7d921e438e19455bbdd65998ffc75d94.pdf?index=trueIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_dd17bd44b559417e83a67a117ed815a8.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_cd819ea3329740aca543b7721c91ef02.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_bc2e1d7658a44328a05284c351b769d7.pdf?index=trueIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_a3979ad147c8434bb2fb4230a1b47081.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/hearthstone_frozen_throne_adventure_guide.pdfIn PDF document text
    • https://3c8d80e7-2998-4b53-b1db-ea2053e4eee2.filesusr.com/ugd/5c8c55_8bea08508b8d4198afab119f7055cf6b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zamuriza/borderlands_la_frontera_the_new_mestiza_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/washington_dc_iad_airport_hotels.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_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 5192 bytes
SHA-256: d572d1fe99762fdbadeddfa952ed6153efc7dfcf6fc4bb475b2b81de147c32d5
font_01_sfnt_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 11108 bytes
SHA-256: cd107f95b7026a106db89c8f54142abc2c064535a5037bdce8dbad44eff641a4

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