Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d9d98f5087e1ae…

MALICIOUS

PDF

69.5 KB Created: 2021-09-17 23:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1fb9d9d62e0835e55b3bdf9a013a8e36 SHA-1: cd04e0e4461c71f066ac5181d4747b7ee4d0c57a SHA-256: 65d9d98f5087e1ae8a635c35e24d24379ae991a42aa8171f3fa71890a9dad44c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are hosted on disposable domains or are part of a link farm, indicating a strong intent to redirect users to potentially harmful sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=visible+spectrum+in+ev PDF link annotation
    • https://viettincapital.vn/upload/files/38176552282.pdfIn PDF document text
    • http://newshop.jp/archive/file/gavufazobilokalinejateli.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/jeniwo.pdfIn PDF document text
    • https://wasael.com/userfiles/file/dobik.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/jusilasorevuwe.pdfIn PDF document text
    • http://nscenter.cn/upload/files/nunokiruselarekuwivojajeb.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/gajovoduxisero.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/gofixedo.pdfIn PDF document text
    • https://businesslife.com/content/files/weterijawasukazobez.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/lelomu.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/xobozimuxamixarafuguwus.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/86791493163.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb55a319ba---82531035756.pdfIn PDF document text
    • http://4bx.pl/public/file/17749892490.pdfIn PDF document text
    • https://bczenekar.hu/files/file/rebezur.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/18076209276.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/kuxar.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/resokuxozekozifevufap.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/99017588756.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/firuxidogefuginoj.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/55514972986.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/94635986771.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/bukibesejupegoritubeb.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/botisuza.pdfIn PDF document text
    • http://mosjob.ru/images/file/74198579040.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_off0000b23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23D 15072 bytes
SHA-256: 4073045b3ccf0ab7cad08f3cc51a123cda54c6f7586263ccc8027656cd66bf8d
font_01_sfnt_off0000d884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09B 10528 bytes
SHA-256: 591756ff1e1628513f30c7c5f2ab1f0b4c096832c66d8d1ade1bb78c1ba08bb7

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