Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc26dc4718507f55…

MALICIOUS

PDF

93.0 KB Created: 2021-10-21 13:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 13be29e0c985408900011a9b1453fb4c SHA-1: cdef0f531de3d35125d10d01cc851ae5f3366b9e SHA-256: fc26dc4718507f55ef63a6d1e546828069c3b1468e8c1ece8faf05686c82ec96
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for a large number of links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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 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 http://le-nora.com/userfiles/file/99246391581.pdf In PDF document text
    • http://uitetenindex.nl/images/uploads/xudolunomov.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/fisokibufanuxam.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/zegaxaked.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/powidemojozat.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/4319138044.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/feditif.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/sizudoj.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/wazofikogefewapuzubilupur.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-1/20210901132745391520.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631396039.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/98611591567.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/71274762777.pdfIn PDF document text
    • https://petikdaun.com/contents/files/83718358527.pdfIn PDF document text
    • http://lblussana.it/images/file/xewifuferiwanilumugoloxo.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/80521468632.pdfIn PDF document text
    • http://jstreetconsulting.com/userfiles/file/zolusen.pdfIn PDF document text
    • http://wirheiraten.de/images/file/96966384011.pdfIn PDF document text
    • http://vina2002.com/uploads/files/28960972167.pdfIn PDF document text
    • https://cartolmania.it/file/47193629842.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/18661740471.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613f3e0a5e7cd.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465e3e9e9e0---64646218420.pdfIn PDF document text
    • http://boden.boj.se/uploads/userfiles/files/peworufavofuzotalar.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/vItLtdF7Pec/uplcv?utm_term=free+green+screen+imagesPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/baluxa.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://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_off000109d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 17432 bytes
SHA-256: 283941b270a6d13c78cc6e1c96200dc2e6b34c6dae154eb539961c4b683efbb8
font_01_sfnt_off00013746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13746 10288 bytes
SHA-256: d969c68dd6f807211499b8239fd08e373d26216da6c5e06e983400b4fe371623
font_02_sfnt_off00014e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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