Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8024f6333458a5c…

MALICIOUS

PDF

78.0 KB Created: 2020-12-30 20:40:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a7f3628bb301e3317fe8f308889c2f47 SHA-1: 84e59f733ab217f4927690ec4b5f81263e41c6c6 SHA-256: d8024f6333458a5c0e7a47942cefb24c3f84a12beb139f021cac02df91cd4265
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign-looking documents, but at least one URL, 'https://trafffe.ru/123?utm_term=studying+populations+worksheet+answers', is associated with a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/123?utm_term=studying+populations+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421960/normal_5fe2dadf5ae84.pdfIn PDF document text
    • https://miniroworopan.weebly.com/uploads/1/3/4/4/134444940/bojetezusofedalo.pdfIn PDF document text
    • https://nixawajumumija.weebly.com/uploads/1/3/4/3/134338940/pekoj.pdfIn PDF document text
    • https://denutuzuno.weebly.com/uploads/1/3/4/7/134706868/3116858.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/nebexipox.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/xukonakefules/nephrology_nursing_journal_author_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ce4e8e-b1f4-4361-9739-3f1adb45abee/25067325203.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/51441175802.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/santa_baby_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/38536215330.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/tusokovumegesaxasipel.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_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 5464 bytes
SHA-256: 432feb825d5709a09531312a6cd8d2ca0a1063bb3e2a9db0c3a57d7f0a27027b
font_01_sfnt_off0000f64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 11392 bytes
SHA-256: 1b80e95330beb4272c14d97fa635cc398258ec61fc5145db6194c1ddd8a056fe
font_02_sfnt_off00011cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEC 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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