Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad168fad59bae2d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-21 05:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 343e14ef0d41d539726055c23dcb3546 SHA-1: de037d9e85ced56e4f4a0bec95865c0edf5626c2 SHA-256: 6ad168fad59bae2d3c9446dd3228bcfe37fb4cd88c73b13544e65a0129da5c77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=schedule+tasks+with+workmanager PDF link annotation
    • https://irrisyst.eu/files/file/68966897465.pdfIn PDF document text
    • https://rubfila.in/files/file/gitofisiri.pdfIn PDF document text
    • https://activepymes.com/pub/file/laroxidusozezole.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/kobalogebofimalobozomuzun.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8c567f5b2---87619288920.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/47563455427.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/refopo.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/najenudefepivejupuvunud.pdfIn PDF document text
    • http://prosquash.by/data/fivulum.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/12860859527.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/kigatufuwun.pdfIn PDF document text
    • https://ijp2.com/contents/files/46085547282.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/xagoluxepix.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/1690634446.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/99958510466.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/92949687824.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/nibupiselopobaniretafu.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/75894805663.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/55170054021.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140809264433---1564954080.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/roranevova.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/15276092466.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/30903275741.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/93970791290.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/kudezu.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_off0000df7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7A 19184 bytes
SHA-256: 423ef0ad915a7ab37d523ed092947f9a2863928615a8bb2c051e74f7f668c00a
font_01_sfnt_off00011208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1F 11172 bytes
SHA-256: b51729168fed0422f69c4793098469f6071af8324fe977a63fc4c2a852fddd3c

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