Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd27d8fc8841e13…

MALICIOUS

PDF

87.2 KB Created: 2021-10-04 14:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3686d8be0853b1cd9bf02035b41a49e5 SHA-1: 1c00610010127be82db9c70845fdb88b4964bcba SHA-256: 0bd27d8fc8841e13680b3e7555f88498f4a604f40f687e1a145423e06780aa26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://allytemp.ru/uplcv?utm_term=solve+for+x+and+y+matrices+calculator PDF link annotation
    • http://topbuild.net/content/xuploadimages/file/ditepamavepofebupokiw.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/mekipokopupajib.pdfIn PDF document text
    • http://lblussana.it/images/file/41863074223.pdfIn PDF document text
    • http://thevalleytrader.com/files/71429926416.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/97051148934.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/18725250748.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/wimelerisi.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/wepudutogolifodazop.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/vokegogezidiberarowuz.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/jivuwedinetefamageg.pdfIn PDF document text
    • https://jonnesway-indonesia.com/ckfinder/userfiles/files/95821574828.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/kexitofukoxituf.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5a468c238---vonuzogalodidibebelujib.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/pijapo.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8f2d1238c---fujadigoweviranezime.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091507313278.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/poxidogulizaroreja.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/tewoza.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/77679044498.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/getegi.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20211003_035649.pdfIn PDF document text
    • https://click2repair.chocoza.com/userfiles/file/lusazatopore.pdfIn PDF document text
    • 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_off0000e643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 11096 bytes
SHA-256: 63afa229ad7d5add692b4f564a805f8d76c73a51ca25ff7889814890a8facdf7
font_01_sfnt_off0001002c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001183e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 20976 bytes
SHA-256: 432b07fb8493a2702850a2f0c985959a38716616efa6712a9680af412ac9203d

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