Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ddb7cf54b09c459…

MALICIOUS

PDF

74.2 KB Created: 2020-12-27 14:59:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a331a8e897f0511868c2ffe52320e428 SHA-1: 0c1833fec2b435917872c2865fb7af634200cd7f SHA-256: 5ddb7cf54b09c4595b42c84518b92dfc5ba115eb1778fddc9b372302d4f99cf7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. This suggests an attempt to direct users to external resources, potentially for phishing or to download further malicious content. The ClamAV detection and ML classifier also strongly indicate malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffset.ru/123?utm_term=bl2+weapon+parts+imgur PDF link annotation
    • https://jesebumu.weebly.com/uploads/1/3/4/6/134617302/9e90881.pdfIn PDF document text
    • https://bokenupipanedi.weebly.com/uploads/1/3/1/4/131483400/4275399.pdfIn PDF document text
    • https://cdn.sqhk.co/jumibizede/fHjfgjZ/pumaxik.pdfIn PDF document text
    • https://gorofegi.weebly.com/uploads/1/3/4/4/134462705/jurerofitopewo_lejirali_towemixizose_pupujoma.pdfIn PDF document text
    • https://cdn.sqhk.co/latipizi/udgiNia/97675947277.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/dumupa/34273564395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4454f80-01ea-4979-8ba2-ea65136c336e/corel_draw_9_free_download_full_version_with_crack_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c359658c-1ae4-4daa-ba3c-92155b3f33fe/bupakomuxiputegetewupofan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74ac0e0e-472f-4bfc-a27f-92cecd4a4da8/sewemuxupeluk.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/32411802532.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/mini_cardboard_house_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/64665501210.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/mere_brother_ki_dulhan_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83c20c1c-11b0-4a3b-b956-a190208d6a05/broadcom_bluetooth_driver_windows_10_hp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a6a45a3-fbaa-4e48-9e42-4e5b3736f6f1/19824615709.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_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 5412 bytes
SHA-256: ec20af5b0dc10aafb4bbc89e1f0bc033d2baa4ddb201d4c6307f59544679b1aa
font_01_sfnt_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 11272 bytes
SHA-256: a0f9f34e78e13f9af0a331fd17a545beebaba8171bb80091b9887dc4394d952b

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