Malicious PDF — malware analysis report

Static analysis result for SHA-256 f396dddb2a83901b…

MALICIOUS

PDF

61.0 KB Created: 2020-11-24 14:27:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 35e55acc4fbff7fa47d257f17b6013d3 SHA-1: 985e18e86ae9e3f4ebf2f9e976e183706019825f SHA-256: f396dddb2a83901ba8e24ec6a58a7054c58b4adbe1f324e817d18377400d50d5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms and phishing. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically identified as a phishing trojan. The embedded URLs, such as 'https://trafffi.ru/strik?utm_term=algebra+if8762+answer+key', suggest a lure to a site offering an answer key, likely to phish credentials or deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/strik?utm_term=algebra+if8762+answer+key PDF link annotation
    • https://ranaxeli.weebly.com/uploads/1/3/4/4/134478161/a93deae8b0ba96f.pdfIn PDF document text
    • https://veriketosamu.weebly.com/uploads/1/3/4/6/134675732/papifodupoxikez-givato-bigimid-vunerot.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/7351575.pdfIn PDF document text
    • https://pogedefulelot.weebly.com/uploads/1/3/4/6/134628496/zivilogeri_kowipexago_siganu_didikozoj.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://uploads.strikinglycdn.com/files/e58a9ceb-fee9-47a5-bdae-c7aea73da27a/early_decision_vanderbilt_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9811319f-4c2b-48a8-b395-12b5ca193231/xepizedebojolezewurigesu.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/8843676551.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/46365923330.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/cadena_de_suministro_de_zara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b984fda6-1df5-4eed-b8d6-1ac46c580a7a/28250551277.pdfIn PDF document text
    • https://s3.amazonaws.com/giwurode/10531166188.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/ncert_biology_class_10_in_hindi.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_off0000a86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA86A 5480 bytes
SHA-256: c1638eb1e1e4b9af3d16928bb9ebfb7fe1fc5ff9f0e447c04fc2e7fae743bd55
font_01_sfnt_off0000bb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2B 8896 bytes
SHA-256: 816bbe183b9fcd499c1463192baaa10b8a8bb8c6e3df8292215da0abbf844229
font_02_sfnt_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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