Malicious PDF — malware analysis report

Static analysis result for SHA-256 159818f6e79e0187…

MALICIOUS

PDF

79.4 KB Created: 2021-02-12 22:03:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: e520e8cdcb7152235d25a125f6006ecb SHA-1: c27977b725cec00ee45050443f8021f56f319273 SHA-256: 159818f6e79e01879f795a7bdcbfa0049a3a3e78d800d44a736991ef61455d40
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. The document body and extracted URLs suggest a lure related to 'Clash of Clans hack apk 2019 mega', directing users to a link farm of SEO-optimized PDF documents. The presence of numerous external links, many pointing to PDF files with numeric or generic slugs, strongly indicates a tactic to manipulate search engine results and distribute malicious content.

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://leonvi.ru/wix?keyword=clash+of+clans+hack+apk+2019+mega PDF link annotation
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/4205043.pdfIn PDF document text
    • http://sodaapp.club/gukapevhmhlb.pdfIn PDF document text
    • http://zojulosopejozaz.iblogger.org/elasticity_of_supply_questions_and_answers.pdfIn PDF document text
    • http://reweder.site/mancala_online_game_2_playerso2uft.pdfIn PDF document text
    • https://xaxiduxaze.weebly.com/uploads/1/3/5/3/135308656/32318cf0b.pdfIn PDF document text
    • http://tubudemawaxoki.iblogger.org/hsc_mark_sheet_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484834/normal_5fdc80eb2f68b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494432/normal_6014e46fdc348.pdfIn PDF document text
    • https://roparinupiw.weebly.com/uploads/1/3/5/3/135392621/973448.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368219/normal_5ffca7b4a01b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lavususixufera.rf.gd/65903105478.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/60416742196.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/ieee_journal_article_template_latex.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/46077802535.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/45535419416.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_off0000fa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2D 5784 bytes
SHA-256: 50718dee9aad107c1bf1bf279dfea9593fd5e2b714a53140b7729718d77d13ab
font_01_sfnt_off00010dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC2 10148 bytes
SHA-256: 82e8c3412c38636b0515173f9a74546d52ea0468d29ce6a79065d8316d6b1796

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