Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8405ffb5717b0e…

MALICIOUS

PDF

79.7 KB Created: 2021-04-07 07:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8d1bc33aaa930421a636df73e871e77e SHA-1: 566d9bb2cf21236dc341965feedc7607b762679c SHA-256: 9c8405ffb5717b0e0ea97d8ad3b28f1aa14192a5cf07d554fe08ad1881361be7
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 0.9992

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/wix?keyword=columbus+direct+travel+insurance+policy+wording PDF link annotation
    • http://cuzinfo.ru/reznor_tube_heater_manualntt7e.pdfIn PDF document text
    • https://sunozidugeb.weebly.com/uploads/1/3/4/4/134486191/4222705.pdfIn PDF document text
    • http://scrlt.xyz/zisibirevatufetfx6w.pdfIn PDF document text
    • https://ruxosegid.weebly.com/uploads/1/3/4/2/134265817/zanujatepujames_nitopariso.pdfIn PDF document text
    • https://rofozewoguse.weebly.com/uploads/1/3/1/3/131384025/2151173.pdfIn PDF document text
    • http://zoneeuro.pro/vusezolusetative1d4x4.pdfIn PDF document text
    • https://fazolusafiwef.weebly.com/uploads/1/3/4/5/134585025/tudodebolo_begova.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7c2a7e5f-de2f-4207-b822-d971188c697e.filesusr.com/ugd/17f605_4820171eedab422e88bfeed918340586.pdf?index=trueIn PDF document text
    • http://luvebex.rf.gd/beowulf_old_english.pdfIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_ddf7e4d82322404d875dfb60c98702dd.pdf?index=trueIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_383d9371d55e4092b16e99cf98e11c36.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1add3cf-8ca5-438e-bf4e-08c6519d9031/85507248649.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_dec1289704c243bfb675e41db8045c68.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/95961649-cc30-4971-8e91-5b7ccc643334/4878338816.pdfIn PDF document text
    • http://sabukizazuse.epizy.com/xikijagewowepoligulexutol.pdfIn PDF document text
    • http://sesoxupapalu.rf.gd/12700564322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9465619d-ab21-4e49-9da7-f16bc18d5379/dragon_age_origins_class_tier_list.pdfIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_09b15fd3a0ea4229953ad2c1176cc43a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcb20f3f-94e0-4a9f-bfbe-af4fb015db2c/new_moon_dec_14_2020_astrology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb28d303-7cfd-4bd5-b6f3-d00f6b93f8cf/94895370073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd62ff58-398a-4a85-9506-fefe18f33fd6/casio_g_shock_rangeman_gpr_b1000_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afe71462-1803-4780-b7d1-0d35db488760/43482775545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28c8d916-0b07-465f-bc51-9166d486114a/how_many_books_are_in_the_secret_zoo_series.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_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 5692 bytes
SHA-256: f738a14255d112c69b24a5a3bc2242816539ab71208beae31b7cba47f0c6f37b
font_01_sfnt_off000108f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F9 11080 bytes
SHA-256: 43bafd5ebf89a2427d722e69dbf5fa94129c8c7f7b5436c560b72a79bc2d537e