Malicious PDF — malware analysis report

Static analysis result for SHA-256 4650a797d60a8ec6…

MALICIOUS

PDF

75.2 KB Created: 2020-11-10 00:57:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1bb10e6726d533ad696e7a25aaf4d8d4 SHA-1: ee61df631dc01c5039b4e9e79c64dd3cda44481e SHA-256: 4650a797d60a8ec69d320acd4c056c786b356c301edf0acbb43cd15e1c625cbf
184 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a phishing lure, specifically mentioning invoice or payment language and callback phishing patterns. It also contains an external URI pointing to a suspicious domain, trafffe.ru, which is likely part of the attack chain. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafffe.ru/strik?keyword=northern+plains+lending+company PDF link annotation
    • https://desaviguwogo.weebly.com/uploads/1/3/1/8/131871994/fulurotobinokexu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/721ef4f1-9cfc-443b-b47c-43cb86962c8d/xibeloxerejavigirefapopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a0f9de-a74b-4d1e-87a9-37d0e38a68d0/meladufi.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/meiosis_activity_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/pokemon_ultra_sun_legendary_pokemon_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/beginners_guide_to_travelling.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/adding_integers_practice_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/uf_2019_-2020_academic_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/741_area_code_united_states.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ac9f7fc-3338-4951-a37f-9ba3eb9f350c/81309482716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0e0710a-adc3-4b01-a854-4ee30efa909d/jileberibetin.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/garfield_games_for_kids_play_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/us_navy_chief_dress_blue_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/35837319019.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_off0000e797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 5556 bytes
SHA-256: e6cbc4721d2fd0680e520084622647c19a0e182ba069536676463c55ac0fe5b7
font_01_sfnt_off0000fa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 11060 bytes
SHA-256: e2f7191abcf83a3048c9856abbb34096c4d23c5f072e60304ae8821834666f9d

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