Malicious PDF — malware analysis report

Static analysis result for SHA-256 d113868358085480…

MALICIOUS

PDF

72.8 KB Created: 2021-02-28 12:11:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c16d663a69d9e9c8180bc4c04113021c SHA-1: 5151f8a1b60cba6917cdd02f3fe229b5fbf90dec SHA-256: d113868358085480b3c244f6af0d3555e25bcf231963e6ad8f5b0a6b9adce389
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, forming a link farm, with the primary URL being a potential entry point for further malicious activity. The document body is heavily obfuscated and appears to be generated content, reinforcing the malicious intent.

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://maypoin.ru/wix?keyword=major+key+signature+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416805/normal_6025b2baa09a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_602c37ca86c26.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/hbUDYij/tebepazolikadixamitodu.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/hdUojhv/solitaire_tripeaks_play_free_solitaire_card_games.pdfIn PDF document text
    • https://pevigegokepos.weebly.com/uploads/1/3/4/3/134366184/xomuredu_gufor_tavodib_mexuda.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/idjhijf/89567256830.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421778/normal_5ff86a5b50239.pdfIn PDF document text
    • http://jagojurezowu.22web.org/tough_mudder_preparation_workout.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/Bhatiif/hair_salon_los_angeles.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvevalor/mja4hhX/webesowev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_6030e77c2a02b.pdfIn PDF document text
    • http://topsalon.xyz/sosasigal7rx9t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 5612 bytes
SHA-256: cf6f104732b6d01bc13aab4203d28194bc94395f31022f19d2224bbf22214b60
font_01_sfnt_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 10740 bytes
SHA-256: 53be2249413803a245739cb7b2f44a7a02304c7a58ce78a5597029d44abef4d6

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