Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce6e9ddce733109c…

MALICIOUS

PDF

87.3 KB Created: 2021-03-02 12:09:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7fe92db682244cd4c49fd96577d52869 SHA-1: 319b75269b50da81e2276fb954b7fb5c4a6b685a SHA-256: ce6e9ddce733109cc9e055bce5974ee9223030025830c1709db82b8c6672cb26
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by both heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://vilenefex.ru/award?keyword=burning+smell+from+lg+washing+machine', appears to be a lure for users searching for specific technical issues. The presence of multiple PDF links and the overall structure indicate a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/award?keyword=burning+smell+from+lg+washing+machine PDF link annotation
    • https://datovize.weebly.com/uploads/1/3/4/5/134508179/7ca03.pdfIn PDF document text
    • http://pusewuvi.medianewsonline.com/how_to_connect_bluetooth_speaker_with_pc_windows_10.pdfIn PDF document text
    • https://sepanafawo.weebly.com/uploads/1/3/4/3/134316973/xovigofuwakivep.pdfIn PDF document text
    • https://sisexalixigana.weebly.com/uploads/1/3/5/3/135323773/xevazaloxixufemiso.pdfIn PDF document text
    • https://wezobugedelu.weebly.com/uploads/1/3/1/8/131856743/1e98152.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/fowamazejokujofabe.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/the_little_sas_book_6th_edition.pdfIn PDF document text
    • https://wirupexulabajes.weebly.com/uploads/1/3/5/3/135322132/f1763c25c1f06.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/tejozelogonaxuvo.pdfIn PDF document text
    • http://zuvinesewuwiz.iblogger.org/rozegaxop.pdfIn PDF document text
    • https://wisadokuresagor.weebly.com/uploads/1/3/1/4/131436967/8357834.pdfIn PDF document text
    • https://tazifidaron.weebly.com/uploads/1/3/4/9/134901468/jifuwolokol-zukiporavu-makupa-joloramalalit.pdfIn PDF document text
    • https://disesusobabetom.weebly.com/uploads/1/3/0/8/130814900/69c4a627f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jisijuvod.myartsonline.com/how_to_bar_a_soldier_from_reenlistment.pdfIn PDF document text
    • http://nazupugifo.rf.gd/bbc_the_archers_podcast.pdfIn PDF document text
    • http://rokodejufoda.rf.gd/pipejexakopi.pdfIn PDF document text
    • http://belibivizonojo.myartsonline.com/47486323600.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_off0001036b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 5436 bytes
SHA-256: a10cfe7fcf9916a67457bb45388f47e775718cc7cc724136f2e528aa6cebd6e7
font_01_sfnt_off000115d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D8 10564 bytes
SHA-256: bfacb4d90fcdfa94f8c817ab09974435f880b243ed885d6dfb0b332a5ed342e8
font_02_sfnt_off00013a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1A 16148 bytes
SHA-256: 51babe3b44e703ca5a92278b053c112c5c116674d3b708c8e2cb3e4aa6bd9a04

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