Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d16acc3958cb88…

MALICIOUS

PDF

78.5 KB Created: 2021-09-16 23:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b5ffd19c09c217f1fae97d8970a131d SHA-1: ae1e62f06bb80735e9dd28d64a04d76828c89bc4 SHA-256: e6d16acc3958cb8858e1f4922ca6035553e494360553ff19f7917555768f6361
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. 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 PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=vakeel+saab+full+movie+in+telugu+online+watch+free PDF link annotation
    • https://pt2-turbo-j3t.com/contents/files/74197070003.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/mububizonemosobituj.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/kevexutezi.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/kelukafimokowofik.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/romar.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/firidawuwez.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407099b4dea---7331602923.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210904041338.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/13700358588.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/80988737497.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/48368539660.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/05/80894095511.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/82541666057.pdfIn PDF document text
    • http://spakimthi.com/upload/files/penigixo.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/16201280599.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/zonevuxekikogogamop.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/veloruti.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/72401243744.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///82940456127.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/62727039704.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/ruvamovegazu.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/topaviwanuwi.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614049c9dfa45---badelunawoviteravituzebed.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/28099504511.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_off0000cc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC23 11236 bytes
SHA-256: 69db0dca8ba7d0088582126425006c2cd766e3ec089725f19adb9a647e633018
font_01_sfnt_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 17572 bytes
SHA-256: 4beac26e6905c81453f5fe8b4c57c9ae50644384065d0cfcc0a0106f241bc527
font_02_sfnt_off0001139c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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