Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab45ec167c6561b0…

MALICIOUS

PDF

76.1 KB Created: 2021-02-18 20:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0a287f5c7c0c133261285dd2bd276f09 SHA-1: dedbf253b82af6835d37247ea8988c451877f42e SHA-256: ab45ec167c6561b0f0f1113b49679d61bdf3681e23162a8db1114dde72abc7ba
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' pointing to 'http://marinarus.space/bimevaxifig4ikz.pdf'. The document body, though heavily obfuscated, suggests a lure related to 'linux clear command history' and is generated by wkhtmltopdf, a tool often used for SEO spam. ClamAV also detected this as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=linux+clear+command+history PDF link annotation
    • http://marinarus.space/bimevaxifig4ikz.pdfIn PDF document text
    • http://curvepreloved.com/jelobeselizodigivedejfxngb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426558/normal_5fd903405c81d.pdfIn PDF document text
    • https://jolidezebixisu.weebly.com/uploads/1/3/3/9/133997790/a36c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420240/normal_5fc90b100f39b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476446/normal_5fe670255632e.pdfIn PDF document text
    • http://teleporttur.ru/easy_lunch_ideas_for_picky_eatersatbrf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393180/normal_600d7bc2d3a36.pdfIn PDF document text
    • https://xosenevofas.weebly.com/uploads/1/3/5/3/135324499/3550935.pdfIn PDF document text
    • https://funotagikaxu.weebly.com/uploads/1/3/1/8/131857914/xipolamemipapevej.pdfIn PDF document text
    • https://bamewubi.weebly.com/uploads/1/3/2/3/132303354/c44d87eb469c46.pdfIn PDF document text
    • https://kuxesilivalagi.weebly.com/uploads/1/3/5/9/135963561/5411167.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/vanatul/brother_whatsapp_status_video.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/describe_yourself_in_5_words_best_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/uc_browser_fast_apk_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/88550504219.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/canales_de_comercializacion_de_productos_agricolas.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/falmouth_ma_police_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/dunisapukogalajune.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_off0000ed23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED23 5292 bytes
SHA-256: e598d3a72d8ec80176a17e4106aeadf383c5e60ad709d0c8db121ededc528dfd
font_01_sfnt_off0000feff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 10504 bytes
SHA-256: 34eb0240e09829dcfe46c74013c201949f4c19cc14c2a970ea8a808440cebe5f

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