Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb35766e377adbe…

MALICIOUS

PDF

124.0 KB Created: 2021-09-17 02:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 890ee06d004e99489cf0652e92bd5fb8 SHA-1: 2347d1a5bd2d07e175cf7ec6cd35765689b1b62e SHA-256: ffb35766e377adbe3c96339dc4fd988686501360396f5ce024fbe60b8b90b190
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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://dadrarad.ro/userfiles/file/xabiboberawadewofat.pdf In PDF document text
    • https://keyword-lda.pt/site/upload/file/purojagevejulopo.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/supobifamomiranewej.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/69333776658.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/25116711182.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/13384197793.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/dojukudivevukamajegabex.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/malasinanuvikevumozofu.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091103341214.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0e14a9e1d---35545265690.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/12410718042.pdfIn PDF document text
    • http://allier-genealogie.org/File:/21269488954.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/73695319922.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/zufus.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/jetejetuvo.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/8971677908.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/82097108095.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/80746914323.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/mexozuko.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/17938067356.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/vewelakur.pdfIn PDF document text
    • http://pedraferro.com/files/files/84460105828.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/9555914721.pdfIn PDF document text
    • https://cape-electronics.com/media/file/70746260497.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/zofumutedaxodorivo.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210904052551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=last+day+on+earth+apk+obbPDF 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_off00017a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A28 20980 bytes
SHA-256: 2fcca669164a0fa61e40b216af274d9543120f67b88955e2013f05f7ddd95f9b
font_01_sfnt_off0001b1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1BB 10656 bytes
SHA-256: a06b32fa73bd2f68ff0bf845c14e9a2b25615d0943f1e8189229973d8e5de9e8
font_02_sfnt_off0001c9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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