Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9a3f9790699650…

MALICIOUS

PDF

75.7 KB Created: 2021-02-19 00:12:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ac7f4baa369ce02b37e0456c3a8f4e64 SHA-1: 2be491411dd53c33e0564deb78b59c8ec32341f9 SHA-256: fb9a3f97906996503b8d0e9e23ee9770d5e93d276c695803b180ba9ae9d386d4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to unrelated PDF files, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded URLs point to potentially malicious domains, and the document body, though heavily obfuscated, suggests a lure related to exam preparation.

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://maypoin.ru/123?utm_term=principais+assuntos+de+historia+enem PDF link annotation
    • https://xoruzokuvomo.weebly.com/uploads/1/3/1/0/131070888/wuravoto.pdfIn PDF document text
    • https://volasetabis.weebly.com/uploads/1/3/4/8/134879514/zupokefetu-zofenesij-temunaror-xositudiledew.pdfIn PDF document text
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/d048768b10.pdfIn PDF document text
    • http://palitra-cveta.ru/how_to_fix_simplehuman_soap_dispensercm6jb.pdfIn PDF document text
    • https://vuxidozeni.weebly.com/uploads/1/3/4/6/134669409/ronazimoz.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/sasufufa/how_to_netflix_on_macbook.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/imgur_meme_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/dewese.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/mugunaraxuz.pdfIn PDF document text
    • http://jejogekatexun.epizy.com/32120449653.pdfIn PDF document text
    • http://faxanudof.epizy.com/ruxafibawelupili.pdfIn PDF document text
    • http://rovunebezub.epizy.com/fitness_tracker_android_6.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/rigudagupivaj.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/pufafivabetixitalifemaru.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/baaghi_full_film_mp4.pdfIn PDF document text
    • http://gewagopixinilu.rf.gd/icewind_dale_enhanced_edition_new_classes.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/25961107038.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/75459675932.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/jiwed.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_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 5284 bytes
SHA-256: 81a6cdd05632f268dbea8ef909b7908f8d24cd4757f61971f8512565da6c2fae
font_01_sfnt_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 13904 bytes
SHA-256: 98ce04f48c353762846438078f325eee6df7e455aff76985f9f226c131a55ad9

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