Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead51c942e303c5f…

MALICIOUS

PDF

90.1 KB Created: 2021-03-09 23:05:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d6db77380dce0e7467af5438565c806 SHA-1: e94b54f4cc401634530d5e2b58e76ef8c53a2d95 SHA-256: ead51c942e303c5ffc1b872c7e572d7fee81d8493850a49e243d85da5820f965
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains and AWS S3 buckets. This behavior is indicative of a link farm or SEO spam campaign, designed to generate traffic or potentially host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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
  • 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://pelibifir.ru/award?keyword=cdf+to+pdf+probability
    • http://xokewekababawa.22web.org/satco_led_fixture_reference_guide.pdf
    • https://vojufutevale.weebly.com/uploads/1/3/4/5/134521456/0263ff5b0e34.pdf
    • https://vepovadubit.weebly.com/uploads/1/3/2/6/132696500/6815c5f93fb593.pdf
    • https://medivurufif.weebly.com/uploads/1/3/1/4/131407406/wusuparizapudonasow.pdf
    • https://jukamonasob.weebly.com/uploads/1/3/0/7/130740128/fegezeraji.pdf
    • https://luvisumor.weebly.com/uploads/1/3/5/3/135390586/4119361.pdf
    • http://infonewsuk.site/dark_souls_prepare_to_die_edition_ps3_save_fileeve6q.pdf
    • http://sukojas.22web.org/classifying_living_organisms_worksheet.pdf
    • http://copyrighthelpcentral.com/ranofasast513h.pdf
    • http://itasummer.fun/bissell_little_green_spot_cleaner_lowesg95xy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xuzed/practice_metric_conversion_problems_with_answers.pdf
    • https://s3.amazonaws.com/nefunupu/new_rap_albums_2018.pdf
    • http://kodasakame.rf.gd/lavikideguse.pdf
    • https://s3.amazonaws.com/tuxalowafokuvo/nitevob.pdf
    • http://vedetav.rf.gd/36865523897.pdf
    • https://s3.amazonaws.com/vutame/tuzegivijifuxakuna.pdf
    • http://xozodijavoxovun.epizy.com/when_parking_downhill_in_a_car_with_a_manual_transmission_you_should_park_with_the_transmission_in.pdf
    • http://govatojajij.epizy.com/compliance_incident_report_template.pdf
    • http://sijukote.rf.gd/bike_racer_apk_mod.pdf
    • https://s3.amazonaws.com/mupukesunobaga/volume_of_cylinder_worksheet.pdf
    • https://s3.amazonaws.com/paxuvagal/rivoresujeka.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_off0000ffc5.bin
1ca47a0e0b39af7b677af20bbd7db87cde89b506675d25cbefe43ba26e5da42e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 5004 bytes
font_01_sfnt_off000110d8.bin
789510464a060deab7498dd3280daf18e0f961fa02b6666ff3b793bc6a9b653d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110D8 16240 bytes
font_02_sfnt_off00014514.bin
ff649d8069e8fb18c13fc7dc166fb6e157bcff57e5602dcde0f82fa569e83567		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14514 16220 bytes

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