Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2afe24dde610f4a…

MALICIOUS

PDF

88.5 KB Created: 2021-09-12 20:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e2da62f3a6d3127c996f2ec0b61bce90 SHA-1: 7212d2153ae7c3a00da613ad6598912c2ad7e78d SHA-256: c2afe24dde610f4a890d1defc6f0f23cc33e724b72baa6f15acfc4ea2cf8009d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, with a medium-severity heuristic indicating a link farm on disposable hosting and another pointing directly to an IP address, suggesting a phishing or malware distribution attempt. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9709

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://magatek.com/documents/file/tapejelazijeribatovifaje.pdf In PDF document text
    • http://96rangjai.com/userfiles/file/48915579861.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/61081536546.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/99930176480.pdfIn PDF document text
    • http://zenkatsu.dk/files/37016013587.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/lajakarumapumat.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210909132439.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2b334bea3---8666180954.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/tubomo.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/dixetegodidesila.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/nemaxev.pdfPDF link annotation
    • http://abwsalisbury.com/uploads/files/vutotakunuvufo.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/jusinomuvun.pdfIn PDF document text
    • http://asid.rw/userfiles/file/lifiruj.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/saguz.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210909_42EF589357137A5C.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/mukab.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/bifezeseleriz.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e334e5808---suneguporawo.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/bobakejorezigalibaxan.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/fesuberenubozipodiduvem.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/52783082928.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/morori.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/3586744229.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/nogifidusa.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109121958276732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=asphalt+nitro+androidPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06A 10340 bytes
SHA-256: 315fed531601a80be0739253c3040e1a6742be1bd0678d578df1007a2e7861d7
font_02_sfnt_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 24396 bytes
SHA-256: 2c3d0f3ec9a25ef46a3fead98be95326d40057043a791fa55a26eb8ba1a36bf0
font_03_sfnt_off000134d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D6 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_04_sfnt_off00013d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5B 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1