Malicious PDF — malware analysis report

Static analysis result for SHA-256 0344a7bb389c86b9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 21:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4814bf27156469e4b9059a28eb64421a SHA-1: 0557ceb7d58230db19e9a1cde67c66dc8ab567e8 SHA-256: 0344a7bb389c86b9ea7d9723ee9f0c4287b63b5a6e199545fe2a457ee34138b3
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external resources, with one heuristic specifically identifying a link to an algorithmically-generated URL hosted on potentially disposable infrastructure. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous suspicious URLs suggests the document's primary purpose is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfda68f2e1---95699568184.pdf In PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/xugibimewitog.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426b6e08d4c---83664991772.pdfIn PDF document text
    • http://trubaopt.ru/content/file/vetuguxetezawewaxe.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/82757461783.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/rekagowusaz.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/xuxulafefelaroz.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210902_5FB7364B44F61B9C.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/fabitukipimofitemigete.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/58389804657.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/wubeserodefobemisatelis.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/96843594556.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/muvozidubebag.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/ragidopopovubexime.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/pojeki.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/24448270635.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/94417965714.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/21690934373.pdfIn PDF document text
    • http://hkwwta.org/userfiles/wivukoxukilujorodetive.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/81318032859.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/28636950053.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/41853940976.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/latilafavagukijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+queen%27s+gambit+online+freePDF link annotation
    • 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_off0000d9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9ED 11044 bytes
SHA-256: b1460bed8ff02bf9c886126730f1c1232ee8cd45f0cd00e6fb56081d2fc37133
font_01_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 18756 bytes
SHA-256: 82d88e0550792f35daeac6416e5688203f6698e28ec53b44f875c672e3299f62
font_02_sfnt_off0001239a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1