Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc51813a5d47bf0…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 04:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c180339ff7527c0737d9454609e663c6 SHA-1: c063e23152523793a9b629090b7949f72e4f0bed SHA-256: abc51813a5d47bf09dfd37e298cbe36abd82dd18ea561de93115249bdeb52030
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. 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. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the true destination or host a large number of malicious links. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://seerupit.dk/assens/file/detabazajovugewenuperusi.pdf In PDF document text
    • http://marisqueandopremios.com/campannas/file/vufixod.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/23099452630.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/xokefelinufara.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109032238167315.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/52391042201.pdfIn PDF document text
    • https://badoza.net/userfiles/file/97825870661.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wimunizomunavizax.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/fuguf.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/42968861259.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/71929442017.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/80918489492.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/31537277688.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/56904447167.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/80407377100.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/512546801.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/98455102365.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16132d4ceba6be---12381082302.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210907013019.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/vuwenulajawejiloserunaj.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/40768911811.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/83445401863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sniper+3d+assassin+shoot+to+kill+cheatsPDF 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_off0000d03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84C 18988 bytes
SHA-256: 63093d79c40445537866f3645e6616cff5195c1cde4089474cb507d07007892c
font_02_sfnt_off00011a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A65 10952 bytes
SHA-256: 9b602a1e9479a0d1bca56acba6b59dd6a2e0df3f9a520a1aeecd5e47d6c31217

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