Malicious PDF — malware analysis report

Static analysis result for SHA-256 502c0b92d41be131…

MALICIOUS

PDF

78.4 KB Created: 2021-04-02 11:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 75c2c279c19365a5c6bb1e18a95170b2 SHA-1: 286bcd4b1f8474bb197ef6d0ce20beb88253ad92 SHA-256: 502c0b92d41be131a2a8bebca36af0fcf985d0dcf916638b49f21853db83ee8b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were extracted, the presence of embedded URLs points to an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://resalured.ru/award?keyword=las+c%25C3%25A1rceles+que+elegimos+pdf PDF link annotation
    • http://vosevazu.iblogger.org/1852998820.pdfIn PDF document text
    • http://polfact.site/homemade_vanilla_cake_from_scratch_recipebevx4.pdfIn PDF document text
    • http://tevubirufizibun.iblogger.org/geligofijikixe.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/igdCZgg/legends_of_runeterra_download_android.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/gcogdic/641702382.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/jAigXhd/dazazujupujisifubotono.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/mihgijm/miwages.pdfIn PDF document text
    • https://rukutatonaneto.weebly.com/uploads/1/3/4/0/134012616/60036.pdfIn PDF document text
    • http://supportcopyright.net/vijawutifusu8hntv.pdfIn PDF document text
    • https://zisirusezudi.weebly.com/uploads/1/3/4/8/134846547/b35ff4b6fc00d.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/fovezewi/56353224855.pdfIn PDF document text
    • http://xovijoj.epizy.com/bulk_carrier_practice_second_edition.pdfIn PDF document text
    • http://zukugomofam.epizy.com/jumax.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/tekogasefobugimugawinof.pdfIn PDF document text
    • http://gokemebazeroxe.epizy.com/54244899192.pdfIn PDF document text
    • http://karifopiti.epizy.com/wimedogokonodokoji.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/514360157.pdfIn PDF document text
    • http://luniluwanurezu.rf.gd/19220658507.pdfIn PDF document text
    • http://setiwifuv.rf.gd/57852256328.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_off0000ee3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 5776 bytes
SHA-256: b599fb6edc4cb2c4298cc670b5f7b16a7572fd80ef33306a7e2c7a6fcbd925c9
font_01_sfnt_off0001013b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 12672 bytes
SHA-256: a6274b935dd1f2ffba110f502c54e6a21792a0a59c7e11ccea4dd2ac82cb6850

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