Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19712d55f319dd7…

MALICIOUS

PDF

75.8 KB Created: 2021-05-25 03:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8053771839750fb4ea57946fcb47bd3e SHA-1: 53824c7f6626a76c1fdb05ad9e6d0148d641b973 SHA-256: b19712d55f319dd77887b545e089ff11d0dbeeccd5d63b8cd6f8f090cf8e44b0
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 0.9997

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://jottigo.ru/strik?utm_term=where+is+the+menu+button+on+my+altice+remote PDF link annotation
    • https://wibizoginoj.weebly.com/uploads/1/3/2/6/132681485/wuban-lapolepitedaxi-sijorelode.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379371/normal_6005db7d6682a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393763/normal_5fe752946b627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443619/normal_601563024d475.pdfIn PDF document text
    • https://pozuzabo.weebly.com/uploads/1/3/4/4/134432083/koriw-sikapopezunoxe-xevevujimisipa-vesonuzege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461525/normal_605d989b4afd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426690/normal_5ff9fcba36f83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388289/normal_6060f69600133.pdfIn PDF document text
    • https://kuximakid.weebly.com/uploads/1/3/0/7/130739256/mizolajozomiwe.pdfIn PDF document text
    • https://fexipipovunozem.weebly.com/uploads/1/3/2/6/132682859/fusitenopibov_kebalitefojikas.pdfIn PDF document text
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/2828365.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/572774cb-25b7-4513-8422-4ede47d28cda/dr_browns_sterilizer_bags_target.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/15584741089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0352a3a2-f913-4fe1-9709-91f288c6cc27/97409703517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c8371a-37ce-4c35-a726-251da588f5f2/26697874994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8777e1a-c422-4631-8f8d-3622acf7cdd7/83655441586.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/avadhuta_gita_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/91133031984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ccf7f2-3061-4c5e-ba22-5fa7612293e9/edgar_schein_organizational_culture_and_leadership_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/81713225153.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/bps_full_form_rbi.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_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 5292 bytes
SHA-256: 619e31fbec485134d13c8d0310221927e7e6b9a96fcd686e2f5005ac088c0bd2
font_01_sfnt_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 11232 bytes
SHA-256: 19d0587c3baf1ccfa2590c3da1ae746d10fd22ff48237a6054ae14a2b07e868e