Malicious PDF — malware analysis report

Static analysis result for SHA-256 691d2c17f43444de…

MALICIOUS

PDF

92.7 KB Created: 2021-03-17 03:21:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59bfd6e257e24d3b0110e50c1a7c467b SHA-1: 18b97453f17c992080550dc4c9ae86c153986074 SHA-256: 691d2c17f43444de0c5e103b64713c03f8541ef8df7804ec3cbec7af822ec843
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://druttle.ru/award?keyword=active+passive+voice+pdf+download
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/xupozixigoziva.pdf
    • http://woxuruko.medianewsonline.com/21059939230.pdf
    • http://online-bestshop.xyz/vigezixovatugojunulawbsmp.pdf
    • http://bajoreto.sportsontheweb.net/66165606347.pdf
    • http://lnstagramcopyrightservices.org/biopsychosocial_model_of_schizophrenia3tw4r.pdf
    • http://mevakimuvu.mypressonline.com/context_based_access_control_systems_for_mobile_devices.pdf
    • https://nakeripa.weebly.com/uploads/1/3/2/8/132814262/8663aaa5e7f.pdf
    • https://xexigajusotojuz.weebly.com/uploads/1/3/1/6/131606060/nipivatikiwu_rofikizuxeru_jipun.pdf
    • http://dipazekonowa.mypressonline.com/cuales_son_los_pasos_a_seguir_en_el_proceso_de_investigacion_cientifica.pdf
    • http://balifruit.com/sabuweliduvokomeposb5m1.pdf
    • http://sibuvre.com/maplestory_reboot_kinesis_guidehcxsk.pdf
    • https://dovizitozul.weebly.com/uploads/1/3/1/4/131408131/pomifajofoxena_botudonobamu.pdf
    • http://goproonly.com/17576193485cxgeu.pdf
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/4127550.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://madigekole.onlinewebshop.net/zefilokitiropodikopeju.pdf
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_6227ca08f1b1440b921f84a7459cbbc9.pdf?index=true
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_b72a744cf3dc406f82b8b38b986b0373.pdf?index=true
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_d4e4e1553f79425c806e76b318ae3b97.pdf?index=true
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_8e317bc9fdaa4fd18b646dd7ff7426fa.pdf?index=true
    • https://143c7e3e-1a56-4739-9c24-5aac26b0263b.filesusr.com/ugd/28d7c1_7a228dd3b4b845c3bab993bc54b97169.pdf?index=true
    • http://zipulosi.atwebpages.com/pimuni.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001161f.bin
ed8b177064ea1cc812a17d45eacd7f40a72acd38acf5ac63323db056b189956a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1161F 5192 bytes
font_01_sfnt_off000127fb.bin
55fd9fded540575952b7385e0a4200175a5b1bda341cb0f1b36c0f4661401a06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127FB 11944 bytes
font_02_sfnt_off0001507c.bin
7abc053b067790dce98f5e0953789ba27cd492a81e299876af0b74551ca50db4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1507C 16096 bytes

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