Malicious PDF — malware analysis report

Static analysis result for SHA-256 3963899d3e703dea…

MALICIOUS

PDF

81.9 KB Created: 2021-04-13 14:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 771f711459da1b689b0064edfced1a2b SHA-1: 7686cd8cc0b0afd34342b57903e997871083389a SHA-256: 3963899d3e703dea1716446fe39d3db751fe4c24d54e338aa6c64df947803f26
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 PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://xezojetit.ru/strik?utm_term=best+book+to+learn+python+3+quora', is presented as a search result, likely to trick users into clicking it. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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://xezojetit.ru/strik?utm_term=best+book+to+learn+python+3+quora PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386361/normal_6013467b6e054.pdfIn PDF document text
    • https://botutubinev.weebly.com/uploads/1/3/1/6/131637728/6261764.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389384/normal_6042d54359908.pdfIn PDF document text
    • https://jugomezaxazodo.weebly.com/uploads/1/3/5/9/135994004/3739140.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460251/normal_5ff19abd14be1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_6032ae63015d4.pdfIn PDF document text
    • https://sadusanolomu.weebly.com/uploads/1/3/4/6/134646393/8248188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_5fe929ac46e53.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/wufujudisu/75206898678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b953c8e-a04c-42ab-9c5e-2ba927329cf3/motorcycle_diaries_soundtrack.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/233417724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a20d1930-6fca-4c89-b729-116bc0cc2d56/how_do_you_subtract_fractions_with_whole_numbers.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/62925655261.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/rulafuxewekisurunoj.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/last_day_on_earth_cheat_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08f146dd-23b5-406a-a2c3-998dffde1146/14514471081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba45b7ac-5d4a-4462-8ad6-39182fc6fbd4/siwaneterumusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/906c7869-d131-4367-b3b1-3d16ea41a2ca/giradewitox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cdd7005-a36d-4dad-a566-b5f9fd6ce700/2350441916.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_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 5552 bytes
SHA-256: d5608186beca2fe96c4bdc4e372b8c7cf3ca5381e3b80db0331f5b4be1a82234
font_01_sfnt_off0001141f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141F 11320 bytes
SHA-256: 20253e82918578a7af7fd56e0c895ae224940cdaf6f19957c001a3f5fd565c56

Open this report in the interactive analyzer, or submit your own file for analysis.