Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73b00ea7d2f6af9…

MALICIOUS

PDF

78.1 KB Created: 2021-02-28 06:39:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 285b93794c92b5262a825d4c51b589eb SHA-1: a0b8ab3138b9400b5d904c4a606553ebbe67ae9c SHA-256: a73b00ea7d2f6af941268650c13de08eb301d9094a5d9129a57ad23060d4d78e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/aws?utm_term=black+and+decker+drill+bits+argos PDF link annotation
    • https://dodilepu.weebly.com/uploads/1/3/4/4/134444379/7d3e2f.pdfIn PDF document text
    • https://lidugozomamaxo.weebly.com/uploads/1/3/1/6/131606349/b286949a14b8.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/how_does_topography_affect_erosion.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/vemosa.pdfIn PDF document text
    • https://besikutusesa.weebly.com/uploads/1/3/2/6/132681218/funekerafana_fifiritemiru_gazewoboli_pajadiluz.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/velisaritadezupipedewi.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/16857005710.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/crafty_candy_match_3_adventure_mod_apkyv5fd.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/yQeggPx/is_pch_lotto_app_legit.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/zategafozasiru/zinoduxilema.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/zombie_shooter_games_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/casanova_malayalam_movie_video_songs_free.pdfIn PDF document text
    • http://bagurofodi.epizy.com/53831294905.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/factoring_polynomials_worksheets_with_answers.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_off0000f3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A0 5360 bytes
SHA-256: ea4c86dc565ac0312db6da19dca28daa681843a8f96b46e3db88961c141bfb58
font_01_sfnt_off000105e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E5 11060 bytes
SHA-256: 654943c09b4fdae352e5db4a5c03ed09e1868d0f5e506ed7bee304090dab2ae8

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