Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f0f93a35af0a79…

MALICIOUS

PDF

71.1 KB Created: 2021-09-17 05:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c44d8c0cd456cb4041b59d12756a817 SHA-1: 2b92fee12205f0687e1ead6c6009476e07dcf32d SHA-256: 42f0f93a35af0a793b9ea2fccd12148272f26720cc0bc462f030e0b8bc55b2cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm designed to redirect users. The presence of external URIs and the overall structure suggest an attempt to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://leganordavigliana.it/uploads/file/37078577865.pdf
    • http://kinel-hunter.ru/upfiles/file/17141099244.pdf
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/tiseregedubujiguxokuf.pdf
    • http://babyshelter.net/assets/upload/files/tutanijetinapabolinutobe.pdf
    • https://stillwaiting.org/userfiles/file/duxanineziz.pdf
    • https://mimpishio2.net/contents/files/nofodukemukab.pdf
    • https://ltes2.tw-goods.com/UserFiles/files/malekimodopofili.pdf
    • http://autoklej.pl/app/webroot/media/files/48430488894.pdf
    • http://www.deco-interieure.com/userfiles/file/78287830940.pdf
    • http://bolshunoff.ru/images/wysiwyg/file/5162666534.pdf
    • https://nikunjfoundation.org/ckfinder/userfiles/files/lojovatoxeliliv.pdf
    • http://suchanekstomatolog.pl/files/file/67822421685.pdf
    • https://skiclubraonbaccarat.fr/pdf/kukakikomozugob.pdf
    • http://lt101shop.com/userfiles/files/gifasapirag.pdf
    • http://sinorarechem.com/upload/files/76418299944.pdf
    • http://hyosangjo.com/userfiles/file/20210906095905.pdf
    • http://splogservice.ru/content/files/pagorelaweluz.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/todejukil.pdf
    • http://dodogs.ru/sites/default/files/file/xurajugutijiloxapo.pdf
    • https://coopinproject.eu/ckfinder/userfiles/files/81010923811.pdf
    • https://kuraniterbiye.com/resimler/files/ziwisonenifegigijajuke.pdf
    • http://shanghaicruiseparty.com/uploads/file/35323161367.pdf
    • https://reitinguok.lt/userfiles/file/43204582504.pdf
    • http://mp-journal.com/media/file/62662361642.pdf
    • http://fazendasaojudastadeu.net/fotosempresa/files/tesafasuw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=adobe+lightroom+hack+mod
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6be.bin
5a73550dcd94c9496cd4c17f7f10fbedc12bd15aea4826f6c817fe64fc11dfe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BE 10756 bytes
font_01_sfnt_off0000cf48.bin
2009f19750f819f2b9b09783126c852a4cfbba16d547526e8486e45c04fa5dce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF48 15520 bytes
font_02_sfnt_off0000f65b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 16792 bytes

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