Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d37681ce409ddd…

MALICIOUS

PDF

74.7 KB Created: 2021-09-12 23:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8b6797c184cf98c7d98716150369c3a7 SHA-1: 7d82445c4b3b33b37d3952498560c2b73fcb46f8 SHA-256: c1d37681ce409dddad479d1d3af08663da21d42fe9836b76d03b1b9d7fb4c715
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bda.ch/ckfinder/userfiles/files/60046976737.pdf In PDF document text
    • https://maviet.vn/upload/files/23899718907.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/leradaxetofiruzurodimozur.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/45153263589.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/2021911113488678.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e6a184a65---84506470831.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109020327586955.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/4751110909.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/netufepodijexabibizoju.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/rakozojikukusukilisuvap.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/65479221431.pdfIn PDF document text
    • https://ever-progress.com/upload/files/gaxorad.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/49262995600.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/95472435753.pdfIn PDF document text
    • http://freewest.at/fitutaxowepazovog.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xorutesimi.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/xekogodiwejesekoluwusox.pdfIn PDF document text
    • http://th-hl.com///upload/files/xiberewosetivanutex.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/90454901993.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133aa1270932---82680690679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+i+get+nfc+on+my+phonePDF 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_off0000bd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A1 18296 bytes
SHA-256: 2b3cc537c60a71040d8b60148ca05518dfc16ad12910de7e0b6d13e5f8f46c93
font_02_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 10780 bytes
SHA-256: 97a31f652fc66da726a91bad7911eadd5798f531761ac760c108cc9bfe408cbf

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