Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6a44131e10b234…

MALICIOUS

PDF

81.8 KB Created: 2021-06-12 08:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6279a7c849931c795bf8a2adbcafbc36 SHA-1: 80e073ae4e4e60b54637288c1b78d0519c7fa8c1 SHA-256: 2b6a44131e10b234ad2a85c13d0e74a7ec418eb3942981e1dab174a30dbf5a25
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://drafthe.ru/pbw?utm_term=problemas+de+razonamiento+resueltos PDF link annotation
    • https://durunefa.weebly.com/uploads/1/3/4/7/134712847/6417841.pdfIn PDF document text
    • https://tavimemake.weebly.com/uploads/1/3/7/5/137513296/xikop_fudaxalutewiv_poxukalokomowam.pdfIn PDF document text
    • https://mewerenazedesaf.weebly.com/uploads/1/3/4/8/134885553/722a43981.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494147/normal_5fdfc6f2845e2.pdfIn PDF document text
    • https://wilexezixokesu.weebly.com/uploads/1/3/4/7/134764798/bafeberelolex_dizisusamemotoz.pdfIn PDF document text
    • https://jenamojid.weebly.com/uploads/1/3/1/0/131070605/8783521.pdfIn PDF document text
    • https://xelemurefitarag.weebly.com/uploads/1/3/4/6/134601467/rokifaxudazepir_jobutavozakak_sidawaz_ledam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391317/normal_5fe253d58dee3.pdfIn PDF document text
    • https://severuzilun.weebly.com/uploads/1/3/4/7/134710190/kuwoketojuwese-lovof-kelonasoridawi-tokefodo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_601bde9faac80.pdfIn PDF document text
    • https://zesefonivileje.weebly.com/uploads/1/3/1/4/131437583/3fb75c243a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://beratirupo.pbworks.com/w/file/fetch/144875601/lego_batman_beyond_gotham_mod__50____Low__0.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/w/file/fetch/144499806/76136418118.pdfIn PDF document text
    • http://kegujomojos.pbworks.com/f/all_3ds_emulator.pdfIn PDF document text
    • http://fevosezew.pbworks.com/f/how_to_get_free_2k20_vc.pdfIn PDF document text
    • http://molitutolu.pbworks.com/w/file/fetch/144998613/3165540145.pdfIn PDF document text
    • http://beratirupo.pbworks.com/f/31801159722.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/f/reruwusawofufugava.pdfIn PDF document text
    • http://wamotarirup.pbworks.com/f/57340543747.pdfIn PDF document text
    • http://wudapokot.pbworks.com/f/8_ball_pool_unlock_all_cues_apk_download.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 5164 bytes
SHA-256: 8c98e76fb9258c82f6c196469f4e65b023d37cb6883cf4473f48ef6a635e1dfe
font_01_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 13124 bytes
SHA-256: 45bf801d4b3d62bc9fec86618e3b1965e8d029afb59f9a713c12784ea0d13c4c
font_02_sfnt_off00012236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12236 16268 bytes
SHA-256: 472d0bc613c4872808e75f60e9a7984a871b4807a076ddf79b641a6133fda4d5