Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca140007e5c1ad80…

MALICIOUS

PDF

86.1 KB Created: 2021-06-05 08:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e0b585ceb731e2275e293ca045f89d24 SHA-1: 2fa748ca52090267d8983139aa41015d436d0d5c SHA-256: ca140007e5c1ad80e98697d59dc83d0b74b3f47e641f9fcefb8def76ec2fbed2
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-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.
  • 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/123?utm_term=bacterial+genome+project+pdf PDF link annotation
    • https://mawebexakonu.weebly.com/uploads/1/3/4/3/134390129/zisarigomije-laratefosiwijid.pdfIn PDF document text
    • https://jazedase.weebly.com/uploads/1/3/3/9/133997310/2e1f87e7f00e.pdfIn PDF document text
    • https://kixesikanunezez.weebly.com/uploads/1/3/4/7/134702505/wesurarajib-rozisovefoki.pdfIn PDF document text
    • https://xigogedamexov.weebly.com/uploads/1/3/1/3/131384098/abba659a2.pdfIn PDF document text
    • https://badasemo.weebly.com/uploads/1/3/4/4/134482086/papazuzikizik-biwodusibido-pakijutasufig.pdfIn PDF document text
    • https://dawikuwavuvuka.weebly.com/uploads/1/3/4/8/134866752/fodumijaxazud-vorezijozukepij.pdfIn PDF document text
    • https://kilogabofavelu.weebly.com/uploads/1/3/4/5/134589148/lizovopuvaga.pdfIn PDF document text
    • https://regisaralox.weebly.com/uploads/1/3/2/6/132681556/11a79ec0cc50b7b.pdfIn PDF document text
    • https://dudabiwik.weebly.com/uploads/1/3/4/3/134354119/9820536.pdfIn PDF document text
    • https://pudajimerexinag.weebly.com/uploads/1/3/4/8/134896131/590b26.pdfIn PDF document text
    • https://saselafe.weebly.com/uploads/1/3/4/8/134894966/zejan-dofovibobarano.pdfIn PDF document text
    • https://wemodolitafuroj.weebly.com/uploads/1/3/6/0/136055174/gesokezinokim.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/dda112ae-09c1-4693-be75-3a6ca9865ced/geometria_analtica_steinbruch_download.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/43454171264.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/w/file/fetch/144460431/52058038194.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/w/file/fetch/144626256/relative_clauses_with_prepositions_grammar.pdfIn PDF document text
    • http://dobifapig.pbworks.com/w/file/fetch/144571158/jirofawix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/716aae7a-dccd-4e7b-850c-ba6a3ff26405/rewugu.pdfIn PDF document text
    • http://xetibubib.pbworks.com/w/file/fetch/144425187/sebinokibulodajele.pdfIn PDF document text
    • http://redejok.pbworks.com/f/dezobamedad.pdfIn PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/144629961/always_kabhi_kabhi_full_movie_online_filmywap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47c10994-0819-4f86-91af-061b23d64847/60715175562.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_off000110a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A3 5424 bytes
SHA-256: 6af7f92d8d99aa73a2d1306afe29f3b5895359253b56345fa21c1c91b20ea594
font_01_sfnt_off00012307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12307 11428 bytes
SHA-256: cff8fd6b0c7290db1ef849c0b38f881a2255dcb26bd56cfd6135c1b4c9541603