Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f907ba62add099…

MALICIOUS

PDF

77.9 KB Created: 2021-03-05 14:45:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0057af0f5a4e9f585f27954f3cf386b7 SHA-1: b11f8029bbb95f05bcba704499f398f669b45122 SHA-256: 48f907ba62add09968f7aab160fd9182288fad451a2f773d62b9911cdc570d1c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, indicative of an SEO link farm, with a primary malicious URL being https://jottigo.ru/strik. The PDF also references a large number of other PDF files, such as https://s3.amazonaws.com/nitizobuv/20258182480.pdf, suggesting a coordinated effort to manipulate search engine rankings or distribute further malicious content. The presence of embedded JavaScript, though not fully detailed, further supports malicious intent.

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://jottigo.ru/strik?utm_term=toro+riding+lawn+mower+repair+near+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471688/normal_60171423df281.pdfIn PDF document text
    • https://wipigoxexidon.weebly.com/uploads/1/3/2/6/132682030/1604906.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444370/normal_6003a72877bad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462980/normal_5fdacb46eef07.pdfIn PDF document text
    • http://mawosatejojeka.sportsontheweb.net/pamudanesajatuxodowe.pdfIn PDF document text
    • https://jixivegeparimes.weebly.com/uploads/1/3/4/7/134749144/2936777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413456/normal_601421746264f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454056/normal_5fd79657a78be.pdfIn PDF document text
    • https://nodararikerat.weebly.com/uploads/1/3/4/8/134885074/bekesetob.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/nitizobuv/20258182480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb20b8d-03b3-48f0-83bf-327dfebf606c/charles_dickens_a_christmas_carol_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b804928f-405f-4514-8514-e24b9257aa2d/lefoxilafemolaxitikugi.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/fundamental_chemistry_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/75861050288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ed58b2-c3b4-4120-8782-353eff394cd3/negeb.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/weezer_africa_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/67854281272.pdfIn PDF document text
    • http://vowojuxibaxo.myartsonline.com/mibemo.pdfIn PDF document text
    • http://xabudavadeguvo.myartsonline.com/kenmore_electric_range_model_790_reviews.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_off0000f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 5144 bytes
SHA-256: ef9f61a34508a5157a7a2f335a1d1230a1c4eea30ded8cf7d8c1cfbf08a1ea76
font_01_sfnt_off00010672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 10440 bytes
SHA-256: 885677af4ea711bbcb3cddc045abb5731ea59fe7da8623f726ca580706af4603

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