Malicious PDF — malware analysis report

Static analysis result for SHA-256 817fa55900b64f98…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 17:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 96e82843d8f0b2e12e479d0848e976f7 SHA-1: 35238fcbea1a1f30f8fbea28132129282da9655a SHA-256: 817fa55900b64f98586a8da1f973969ef38b3f12050a2abc34c53c8b42a9ddd8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are unknown or potentially malicious. The presence of embedded URLs and the link farm nature suggest an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://career-id.org/ckfinder/userfiles/files/noteregagoguwame.pdf In PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea97ef72f---bexik.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d2a931f2---35457655456.pdfIn PDF document text
    • https://birudongker.com/contents/files/48762029998.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/28774096670.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/15354121201.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/zisovewezolu.pdfIn PDF document text
    • http://agrion.org/upload/fichier/22329322630.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/89725852705.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210906214954.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/bumekud.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/53965659779.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/30230755732.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/17977688122.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/23658569095.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/74259140531.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/72479158581.pdfIn PDF document text
    • http://aminotp.com/upload/files/tanip.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/pelexedoluzafobem.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/dusepamo.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/tazudafifuzonuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=real+racing+3+hack+mod+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_off0000d657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD657 11004 bytes
SHA-256: 8a6e1e99707928e5f40431917fd131f3193a48ca9496ea88730df330272737bf
font_01_sfnt_off0000ef70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF70 18320 bytes
SHA-256: 3ddce46413861ae64a9bd79edd9846696ce94dbdfd454ce6bfbd9f319d062c24
font_02_sfnt_off00011f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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