Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1490a6b7f2b0b0…

MALICIOUS

PDF

65.7 KB Created: 2020-12-05 18:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 51ffd608a653632e7d0c79fddfa90705 SHA-1: 06e93ff08d00a5bd2ec391edf90c4a77dc77690d SHA-256: 1f1490a6b7f2b0b08382b63ef0624859d8cdfd4ef2abf345a93b7ef0d21a2f20
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, suggesting a link farm or redirection tactic. While no scripts were explicitly extracted, the presence of external links and the nature of the detection indicate a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

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/aws?utm_term=farsi+to+english+dictionary+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5fa2651629204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474456/normal_5fae9ca5e0811.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/sinafadatumugefuw.pdfIn PDF document text
    • https://gadigode.weebly.com/uploads/1/3/2/6/132680949/lebamug_ximisefitaza_kokegupi_wigabevuzelez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2723bca-588a-4b07-b1f1-8d2ebe8dd7bc/82427401311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e06efb5a-5792-4bf7-83f0-5ef73a2c9d74/tefoligulok.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/blaptica_dubia_wikipedia.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc149a6a3bf4b14ababd147/t/5fc4b2c46457125654d05610/1606726340702/46516382860.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc191a61452f90b7fea0e1e/t/5fc2b8b33c02f22b9d664bf6/1606596788420/momupodizikaxewijim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5086b991-84ca-43a2-967a-0fd04b1a040b/xowove.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1ae84085bf90c0e029602/t/5fc442e73485235c864daeb3/1606697703592/11215588320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2375549a-291b-4a1e-acf2-5cd10a5d7b3e/37314443005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f32c7677-f1d8-4ea8-829f-e2c9f510f525/fofola.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_off0000c538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC538 5472 bytes
SHA-256: bda7728dc47426de37a53583cafbdcd1afa4362f8e621842bf891edbb90e50df
font_01_sfnt_off0000d7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 10012 bytes
SHA-256: fad76e55dcf168815c4a3580c3080793772864a39cb2907a3655264d0635df80

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