Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f28046aace7f80d…

MALICIOUS

PDF

34.5 KB Created: 2020-11-09 17:26:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6b59c88ebed2c58f2939b29722226ff0 SHA-1: eefc021e16d3af70eb5992d216cbf6657fd067d1 SHA-256: 5f28046aace7f80d45591191054b9f97bd78f31659b6d2ae6835cb8ad8d83e52
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, identified as a link farm. The primary URL embedded in the document body, 'https://trafficel.ru/strik?keyword=the+song+funny+how+time+slips+away', suggests a potential SEO manipulation or traffic redirection scheme. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of harmful intent behind the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://trafficel.ru/strik?keyword=the+song+funny+how+time+slips+away PDF link annotation
    • https://lufavipipoj.weebly.com/uploads/1/3/4/5/134580953/3e9a3f0664bbfc.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/wewebunovemerifabo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422168/normal_5f990bb4f1146.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_5f932af752d64.pdfIn PDF document text
    • https://ronizozobofer.weebly.com/uploads/1/3/4/6/134654069/4418265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415929/normal_5f956ca97fefc.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/gufifiwet-jilezevemabo-ximaj.pdfIn PDF document text
    • https://wiwawuvagowe.weebly.com/uploads/1/3/4/4/134496439/xikeligojatefe.pdfIn PDF document text
    • https://lepitosamodovax.weebly.com/uploads/1/3/4/3/134335454/luvofilanufe_bukarofebalugok_ferusugato.pdfIn PDF document text
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/8431627.pdfIn PDF document text
    • https://valoxapemep.weebly.com/uploads/1/3/4/3/134305175/fuzalenuzunisew_venunerol_bagilakujop_jupopijujifufez.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/wunojipu/bird_worksheets_for_preschoolers.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/71310376026.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_off000047eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47EB 5364 bytes
SHA-256: 7e4171e0473de49688e3e7bcab159c04b30b836b8515bcfebe2b21e2d092f318
font_01_sfnt_off00005a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A1D 10204 bytes
SHA-256: 21a68c035d9d9824c0658c11734cd846a44b480850d4db20bd0c9be9ec2975d8

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