Malicious PDF — malware analysis report

Static analysis result for SHA-256 d464162c856f7ce2…

MALICIOUS

PDF

61.4 KB Created: 2021-02-11 11:59:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: cbf2257db547d2c6e6ab58f457ecc9ed SHA-1: db36a9725ddedef394a593756d8cc7ea04bff635 SHA-256: d464162c856f7ce20bf71aa46ffbcb33417b8feb3b29f014482805e56450d185
186 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 pointing to disposable domains and hosted on services like Weebly and sqhk.co. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=star+trek+online+starfleet+engineer+build PDF link annotation
    • https://zodurulamenuvud.weebly.com/uploads/1/3/5/9/135956643/b8b77ff2570d8.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/izgjibq/39352134392.pdfIn PDF document text
    • https://rowagikej.weebly.com/uploads/1/3/4/6/134678960/fuvilibakamov.pdfIn PDF document text
    • https://cdn.sqhk.co/tarekekog/jafIa4s/afterburner_dgd_leak.pdfIn PDF document text
    • https://cdn.sqhk.co/rosojolude/RgcxZib/jamarawej.pdfIn PDF document text
    • https://cdn.sqhk.co/posuwumujome/aicGgjr/23661963336.pdfIn PDF document text
    • https://rosowimibezot.weebly.com/uploads/1/3/5/3/135392622/lalineku.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/a6ibhjV/word_blitz_facebook_messenger.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/cghbDhi/zombies_board_game_twilight_creations.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/ggjf7gj/love_live_school_idol_festival_allstars_tier_list.pdfIn PDF document text
    • https://farazekij.weebly.com/uploads/1/3/4/3/134379469/403467.pdfIn PDF document text
    • https://joletumutete.weebly.com/uploads/1/3/4/8/134871701/9299700.pdfIn PDF document text
    • https://tekevifumufov.weebly.com/uploads/1/3/0/7/130739519/6231301.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/5T3czal/kitupalurosigo.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/webipejonavuv/coliform_bacteria_test_kit_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/chandigarh_police_pretty_bhullar.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_off0000b469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB469 5380 bytes
SHA-256: 6bb780c8a0ede8f9eae3d0eadb75cffc3e5a58b0f22ed313d38ba65bff8129c2
font_01_sfnt_off0000c6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C1 9960 bytes
SHA-256: ea6af6c35919fc2420298fd3d3b3e23fdd9376943dc1512fcc145894412f8f7d

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