Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de905a46412f6f8…

MALICIOUS

PDF

76.7 KB Created: 2021-03-16 04:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b0d0fa8ff4472b1736824e717057a8d8 SHA-1: bb68e6ff7d0cf1b91caefde841d4ad684bb8fc6a SHA-256: 9de905a46412f6f8d4b6e6defd53b643f8c770121b759d944d8a80c334bcbbc5
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 0.9995

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://gimoguvi.ru/123?utm_term=lagu+atikah+edelweis+full+album PDF link annotation
    • https://nibukebomuxa.weebly.com/uploads/1/3/1/4/131455734/vimipanokunojobu.pdfIn PDF document text
    • https://moxatabik.weebly.com/uploads/1/3/4/8/134885740/pifizepesufatulekip.pdfIn PDF document text
    • https://mijonuguvozu.weebly.com/uploads/1/3/1/8/131871478/firozivuz.pdfIn PDF document text
    • https://janikopet.weebly.com/uploads/1/3/4/6/134690806/kemexulapapigula.pdfIn PDF document text
    • https://pirulavedup.weebly.com/uploads/1/3/1/3/131379447/nijimotu_sezamaronivep.pdfIn PDF document text
    • https://dafozadojav.weebly.com/uploads/1/3/4/7/134764431/juxawofafimo.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/dujepav/79652454529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/271e6659-d8f2-4b20-8c41-35a9d8ce56f0/tuzovubowuwafozebujemuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cfb13ae-c795-45dc-8737-2e332b82e3cb/nudeleda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cd67703-46ae-451f-b297-1bd87d56afcb/tumifuretetikig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85c1b1e5-f79d-44f8-876f-8323a11154dc/how_to_prepare_contribution_format_income_statement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02b01c2c-c37c-413d-857a-78acb42f47f1/rimito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a0a56c7-1423-4392-80d1-f12f0b3783d0/6896097228.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/birthday_indian_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/43854728010.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/anaganaga_punnaga_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc6dbef6-0c70-4e36-a58d-e3c8e51123ff/bijozin.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/dugumunufekisowubodavaj.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/futopowolusubajekale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01ebc6a9-358c-4888-9a96-552ea0bb3048/red_hat_linux_administration_certification_study_guide.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6C 3180 bytes
SHA-256: 1c0a71d4e690093df212b2efc474e9d65be97b6305c1c1e80d10624413d1577e
font_01_sfnt_off0000dab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 5460 bytes
SHA-256: b9e89c2583a4ce501a333a781ea89fdfb394730c785fc7c2f8b621541c7e1b71
font_02_sfnt_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 9928 bytes
SHA-256: b463430f377b52c5b14e1a32ae9168d696898ca08ba81862ad6b5b792698d01d
font_03_sfnt_off00010f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd