Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd2bd874fb2147e…

MALICIOUS

PDF

71.5 KB Created: 2021-03-06 05:53:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 58d797b2d06c8a88205b118f02136769 SHA-1: 85bf27aeca970e5c3c3a41bfb0d759094b6e18c2 SHA-256: fdd2bd874fb2147eff00d467f5e19c1e881f1b1584dbdd5090a7443c729b87ec
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=what+is+the+emotional+brain+called PDF link annotation
    • https://cdn.sqhk.co/kekotenonaxu/8jbihbq/neha_kakkar_all_new_songs_2020.pdfIn PDF document text
    • https://gapibuxox.weebly.com/uploads/1/3/2/6/132695643/f93bd739b.pdfIn PDF document text
    • https://nupezodebugu.weebly.com/uploads/1/3/2/3/132302780/vagibijolesizavomuno.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosira/jKifgGB/tree_related_team_names.pdfIn PDF document text
    • https://cdn.sqhk.co/dosojegomugu/jh3Phe9/heroes_of_order_and_chaos_apk_award_minecraft.pdfIn PDF document text
    • https://gofegupozomo.weebly.com/uploads/1/3/4/4/134479888/ede6faa9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/internet_speed_meter_apk_pro.pdfIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_50144388428f4cd7bde15da1398834ff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc92b209-14f3-4726-ae79-fc5a50b729d0/89147594168.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/lavinonapivu.pdfIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_2718d37091f6487b94d41acb36ce175f.pdf?index=trueIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_9e7e9e5d8de04b808dd535d55ae8568f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/brick_breaker_star_space_king_hack_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d1965f9-d50b-4578-b7e0-0ed8594f049d/how_to_take_apart_3m_worktunes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acdb76e1-0aa4-4c24-90a8-c4e99e77e7a3/35258323856.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/17182295149.pdfIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_7877550426cb44a9a3ceccc158f971f0.pdf?index=trueIn PDF document text
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_b4af0fe0a6364686b6d7d5f57c9b7249.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bfad9fc-d86f-4c2f-81ad-0f2c8864e66a/us_postal_service_international_research_group_address.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF98 5120 bytes
SHA-256: 39f85ec7846e3aed0190d6f0edb672c3c54b40c713be463c172a37192569b11f
font_01_sfnt_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 9920 bytes
SHA-256: 34150295d9bc2025883fb267dde93a767f79e55f53250cfe6c53c804178ee0f5
font_02_sfnt_off000102c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C9 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333