Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c132c0c97fbb77…

MALICIOUS

PDF

69.2 KB Created: 2021-01-24 20:32:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4aaedf72e1e19e53f709527bfe5622af SHA-1: 485901821d14a0d83c2435d3647026506c9c8bac SHA-256: a3c132c0c97fbb7760e9539a0dbf325977bf4350650383855827d656cd8d27e2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO link farm attack. It contains numerous external links, with one pointing to 'https://traffnew.ru/123?utm_term=darte+un+beso+lyrics', suggesting a lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, likely intended for SEO manipulation or to distribute further 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://traffnew.ru/123?utm_term=darte+un+beso+lyrics PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368230/normal_5ff69374b03de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413362/normal_5fe08dcd18a7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420434/normal_600ceb1edf07e.pdfIn PDF document text
    • https://jevomijaled.weebly.com/uploads/1/3/1/8/131856338/puwumupidod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449992/normal_5ffe725f6ca07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470692/normal_5ffe43fc84135.pdfIn PDF document text
    • https://galesarenad.weebly.com/uploads/1/3/4/3/134380117/74c3670e494d.pdfIn PDF document text
    • https://taxubixud.weebly.com/uploads/1/3/4/7/134760406/b5528a7046662.pdfIn PDF document text
    • http://gedawuxofawu.iblogger.org/laleluvilevogagibexof.pdfIn PDF document text
    • http://gopubewigofopa.iblogger.org/electronic_catholic_bible_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375093/normal_5ff9744ab5a99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379032/normal_60097abfab0ac.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
    • http://fofuxolisemaxim.epizy.com/90637542763.pdfIn PDF document text
    • http://notavopanugatog.epizy.com/battlefield_3_games_free.pdfIn PDF document text
    • http://palakojum.rf.gd/punozef.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/nixitipuremede.pdfIn PDF document text
    • http://fulawumobolofog.epizy.com/rounders_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/complex_sentences_worksheets_ks2.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/bededepidomalifi.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_off0000c227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC227 4916 bytes
SHA-256: c094cde4c42c922653adc2352152a1c4a4c574a2833c2e14fd1f58641716ad85
font_01_sfnt_off0000d2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F0 11324 bytes
SHA-256: 2bf5198a6f43369d2fc6d7c27910fbbf1587bbc567017dbfb690947ec463187b
font_02_sfnt_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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