Malicious PDF — malware analysis report

Static analysis result for SHA-256 4175e68efcddc52b…

MALICIOUS

PDF

79.0 KB Created: 2021-03-23 20:01:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ce48f2deec158b1fb4af503ab6d8d8a7 SHA-1: c64df633a862d3bc57a18b885ef953912fb5cc3a SHA-256: 4175e68efcddc52be3861377a7d92a64560500fb9c1b6f4425ae657c1f8dfdec
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/aws?utm_term=masterbuilt+oil+less+turkey+fryer+recipes PDF link annotation
    • https://cdn.sqhk.co/fumamimed/xbyih6Y/gexadajodato.pdfIn PDF document text
    • https://bileravufal.weebly.com/uploads/1/3/4/7/134749654/87fede814a8686.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/ghhg6hf/make_it_up_to_you_meaning_in_malayalam.pdfIn PDF document text
    • https://lukajupuxeburi.weebly.com/uploads/1/3/4/6/134630189/jizexusugeviwos-xirevezurele-sajuna.pdfIn PDF document text
    • https://cdn.sqhk.co/luveruzosu/dFhaovq/rocketball_championship_cup_mod_apk_download.pdfIn PDF document text
    • https://dibozavo.weebly.com/uploads/1/3/4/5/134501923/63ecf0b7.pdfIn PDF document text
    • https://botutubinev.weebly.com/uploads/1/3/1/6/131637728/xofol.pdfIn PDF document text
    • https://cdn.sqhk.co/komajekolino/LdheKnL/zototagidozufopenavorez.pdfIn PDF document text
    • http://xitigedomure.66ghz.com/fidib.pdfIn PDF document text
    • https://tubefirijivu.weebly.com/uploads/1/3/4/3/134351006/rigonukud.pdfIn PDF document text
    • https://lawukexudemodu.weebly.com/uploads/1/3/4/0/134041757/2480470.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/wKNshjs/word_cookies_daily_september_22_2020.pdfIn PDF document text
    • https://gobodozi.weebly.com/uploads/1/3/1/3/131398455/jupipuziraguva_ziniwegam_suvor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guwaduroredidaj.rf.gd/new_antibiotics_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/how_do_you_know_if_someone_is_having_an_emotional_affair.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/10512525052.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/mutigadedobelo.pdfIn PDF document text
    • http://genufewewirim.rf.gd/kafikimumujanezeti.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/32082193197.pdfIn PDF document text
    • http://xilavivugup.epizy.com/blank_college_degree_template.pdfIn PDF document text
    • http://jemuxopirale.rf.gd/vekolupiditimofara.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_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 5320 bytes
SHA-256: 61db39777870ae5f21f0f9aec17e782756facb059270fdf103f8e89bba41a96b
font_01_sfnt_off00010957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10957 10752 bytes
SHA-256: 2883577d7022c26a1720ca5b48487f7d9f4978eb406712d8ed5709d81882a7cf

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