Malicious PDF — malware analysis report

Static analysis result for SHA-256 049f1be15c571144…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 08:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1cc1b6e14bc1040c2273748e834c933 SHA-1: 691721d2db51a9001feb64451c83fc42255b0eb8 SHA-256: 049f1be15c571144254745e767fa87c57676b35374d9182838bdde365334debe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains. The presence of many unknown reputation URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sofanet.ro/ckfinder/userfiles/files/87782178853.pdf In PDF document text
    • https://equator-maritime.com/userfiles/file/82049125558.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/90069072687.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/gimazafalikululiros.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/posuvebeminer.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/buxukezo.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/18417543184.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/4282738274.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/11067358407.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/50039493712.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/bixudugepepifej.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/danuwowufu.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/82194156943.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/mujufatoxijenonazir.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161313e6738719---jemufawubamaja.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/fojepinukerizexirapari.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/jamolefawatudik.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/44685453156.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/zomonuverisemunenefamuve.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/pudizilonipuvogeg.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/75551021702.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161390ebec31b6---wafefebujunix.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/dafekapuzoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=hot+wheels+stunt+track+driver+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 10800 bytes
SHA-256: 8dad19735731185c90f76dc6e399ad7ea439a2d084e88f8527896ed03f7febd0
font_02_sfnt_off00010834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 17436 bytes
SHA-256: a84c085332b4aba8152eb6911221c86b6f175cb06a95d900fd1a134942eff2b0

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