Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7ac50588f43602…

MALICIOUS

PDF

63.2 KB Created: 2020-11-24 07:21:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ee1657f67812d7c1810c94a027ede6bb SHA-1: e5d0697840f032e5f460bb7b17068eecec74e145 SHA-256: fc7ac50588f436020264835533973487a502fc3d5ffffcbc0bb2780315869fca
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution scheme, likely initiated via spearphishing.

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://traffnew.ru/strik?utm_term=inverse+z+transform+matlab PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379498/normal_5fb31bda15c7c.pdfIn PDF document text
    • https://xutetuzaxudekit.weebly.com/uploads/1/3/4/3/134371691/9703906.pdfIn PDF document text
    • https://gesofomudejow.weebly.com/uploads/1/3/4/3/134344239/pukal_nilugopenama_menaxanuk_wamowanol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5f887da1d9302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451542/normal_5fa8eab8b3d16.pdfIn PDF document text
    • https://bawujepal.weebly.com/uploads/1/3/4/5/134515469/wejerarurujuwip-jozad-kazakufesabo.pdfIn PDF document text
    • https://gimezoribetigaw.weebly.com/uploads/1/3/4/6/134676461/87aac3e818c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5fb668aa565ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416798/normal_5fa34aadaddfc.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/jexijer/walmart_mainstay_flannel_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/appetizer_recipes_with_puff_pastry.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/30295316313.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/71299634539.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/2018_fantasy_football_cheat_sheet_auction_values.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/contents_page_template_google_docs.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_off0000b9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AC 5100 bytes
SHA-256: 9f02b0122e9c387e235bee0c2d462da51c75f5470af6a16ecbb748e77f72a2a1
font_01_sfnt_off0000cafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFE 10884 bytes
SHA-256: 0722c48f439366c2645984596b646da93abf50a23efcdae8449452209b47ec32

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