Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ee0d1fabccdd3e…

MALICIOUS

PDF

78.7 KB Created: 2021-09-13 04:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 100c54fa69b8b4b8ca2b87337214d94d SHA-1: f519a7d18490f756868f8fe9341438431f595db5 SHA-256: 34ee0d1fabccdd3eaa77ad4b716d3c1a8c5a5bf39b0b1572fabcffb7588f98a3
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. The heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files, suggesting a multi-stage download or redirection scheme. While no scripts were directly extracted, the nature of the link farm and the detection as a trojan implies an intent to deliver a secondary payload or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://minhnguyenvn.com/uploads/userfiles/file/tuxawaloxuboxibelale.pdf In PDF document text
    • http://msinziniering.com/userfiles/file/jupobakutijupogezoz.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/musevemebugodugajit.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/videmidoxesemevomalewatad.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/wozusira.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/tepes.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/80615990771.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/vinakixedovavesoparaji.pdfIn PDF document text
    • http://taigesw.com/upload/files/satiwevex.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/kutudupawef.pdfIn PDF document text
    • http://spbi.cz/res/file/45749310713.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/97035094803.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/bupupafafuvepomeva.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/23794701106.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/5830527464.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/devobofufuriwufopemebize.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/79190710356.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/midanuxiximevov.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/61941502801.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/bifapomepewaviripe.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109092226541938.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/82747439483.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/menotorolelumeze.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/32086286322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=faug+download+apkPDF 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_off0000d08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08B 18076 bytes
SHA-256: 529a6e0dbf8eb4d1f22d2289d8b5c06da38f5b727fe7d6b9c24ba7c1d502814d
font_01_sfnt_off0000feb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 10232 bytes
SHA-256: 2836a395a3aa7b83ba0955060af719a12467b158bcd86980036291d21bae7ee4
font_02_sfnt_off00011592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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