Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb4000aa938459f…

MALICIOUS

PDF

63.4 KB Created: 2020-11-25 07:43:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8ccfe0e9eb6c8dde60be38133e7d8830 SHA-1: 904ba73d071687f001f485e8700bc9d60804efe3 SHA-256: ffb4000aa938459f4ca66929947fd0f6b91c9510d4f912ca98604e0bf6f7a82e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with the primary URL being 'https://trafffi.ru/strik?utm_term=galaxy+s6+edge+plus+girly+cases'. This suggests an attempt to drive traffic to malicious or phishing websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffi.ru/strik?utm_term=galaxy+s6+edge+plus+girly+cases PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373517/normal_5f8f85434e925.pdfIn PDF document text
    • https://xeludelibiw.weebly.com/uploads/1/3/4/3/134371965/4214974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383471/normal_5f9cdf07dcc88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5f9c62f0a50c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458132/normal_5fb409c015522.pdfIn PDF document text
    • https://tubefirijivu.weebly.com/uploads/1/3/4/3/134351006/wofulopi_wapovinunel_dipod_kigopeselerit.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/pafiganovavi/catering_menu_ideas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d3a5a24-ed74-49d1-995d-922f7cd238b1/73896428516.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/21341345804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ea2c1d0-bd88-4f82-9f49-cd01be0a66a7/ariana_grande_my_everything_album_sales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1feacf68-2b96-4373-a66c-f9855ce46465/john_model_of_reflection_2000.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/milajozepevonoso.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/rujitinapexagimipuxap.pdfIn PDF document text
    • https://s3.amazonaws.com/vibove/prejudice_stereotyping_and_discrimination_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc2f5438-bf5a-409a-8f2c-edff379d0f8f/8316535353.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_off0000b0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C0 5180 bytes
SHA-256: 0c7718bd0855333b211001d4797fafde602de88e7b441a5fbeea16f1071196dd
font_01_sfnt_off0000c27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27E 9284 bytes
SHA-256: 56c981da5cfe9e3637c9993b69238f727617b503d2de95278fc88076d6e91bf5
font_02_sfnt_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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