Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d12175d26b9232…

MALICIOUS

PDF

79.9 KB Created: 2021-02-24 10:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c816e02413ad293a8a05dee2d7a8e35d SHA-1: d9fc528fefeb383d5a41e9759d160fe2e3a9d726 SHA-256: a8d12175d26b923206905a3a5eba86ab076d7eba507748b6bc130cfcb711cffc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to artificially boost search engine rankings. The primary URL, 'https://jacksth.ru/wix?keyword=the+cave+apk+mod', suggests a lure for users searching for software modifications. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/wix?keyword=the+cave+apk+mod PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393033/normal_5fffe74a9b175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394060/normal_5fd98b0e8164f.pdfIn PDF document text
    • https://tofujifudaxibav.weebly.com/uploads/1/3/5/3/135326414/tefakajug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447646/normal_600b8dba49bb5.pdfIn PDF document text
    • https://mozufidapu.weebly.com/uploads/1/3/4/0/134012608/3406979.pdfIn PDF document text
    • https://xubebedi.weebly.com/uploads/1/3/0/7/130776367/17899bcd72bcacf.pdfIn PDF document text
    • https://diwamelebo.weebly.com/uploads/1/3/4/1/134108813/basatenuxox_simedumi_sokipejoligu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465398/normal_5fded9249fb32.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vatezajis.rf.gd/theme_for_ppt_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/my_talking_tom_game_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/buginajenuwakadexemurora.pdfIn PDF document text
    • http://pakafadudu.epizy.com/jutuxupikit.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/soul_worker_zero_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/android_file_transfer_mac_os.pdfIn PDF document text
    • http://zumemopusel.rf.gd/vesokufimozovopefi.pdfIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/26083259764.pdfIn PDF document text
    • http://rolonitefokive.rf.gd/nowokad.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/akhiyan_ne_ronaoy_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/evaluating_fractional_exponents_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/50680648369.pdfIn PDF document text
    • http://vezubigaru.rf.gd/65198739838.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/wegadad.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 5080 bytes
SHA-256: eed6f5317d71a91c25772a345d83af4a91b48a0cc7a5228f21b9cca7e247bb76
font_01_sfnt_off0000f9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DF 10184 bytes
SHA-256: fcfe96b273253ceb2a00c63466f0b5d67430a167c49fa60cede0639e2cf9dc6b
font_02_sfnt_off00011cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF1 16100 bytes
SHA-256: b0627a486dcaeee434fe5ad07bf169d6615d29e40b70de469c6017e3e4f2a7cc

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