Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a40c0c89d9fddd…

MALICIOUS

PDF

75.8 KB Created: 2021-09-21 22:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e616fb3482cf716d2e97d8ff7d3da27f SHA-1: 67836aae1b62508a42607c4b9daac4864a9ddeb4 SHA-256: f1a40c0c89d9fdddbd958e62f007ee0c13165e6bcb31065a92c4c04b6c100f0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting its primary purpose is to redirect users to potentially harmful websites. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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=naval+craft+mod+apk PDF link annotation
    • http://hide-bo.com/img/tmp/file/25338807647.pdfIn PDF document text
    • http://355353.ru/userfiles/file/lekitagug.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109151548365888.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/fakexitano.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/tuniwabumij.pdfIn PDF document text
    • http://sieuthibds.net/images/files/97182106577.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/wozamuzog.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/e56e4daf6f6b48411e843838b9ba880a/bufijito.pdfIn PDF document text
    • http://artio.pl/files/files/64329254102.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/41812913642.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/gewer.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/vevaxotewegavon.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/verunawiponaw.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/51773076320.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346387a04a7---93158775568.pdfIn PDF document text
    • https://tele-video.ru/upload/files/nedatur.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/savobefigutagileko.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/45912130964.pdfIn PDF document text
    • http://akademibt.com/resimler/files/movapanitut.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210917231643.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/notojisibalanor.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/58826585901.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/xulebijusela.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/fexol.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109190003592886.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210910011927-dabalabivigopezaxak.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_off0000b96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96E 21256 bytes
SHA-256: 703e371dd33f4ecc560c3368dabbbd87967c3aed3c27bf84fde1683f9c9eca04
font_01_sfnt_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 10420 bytes
SHA-256: bcb74f9b07ef9bd16e7c405e3fad747de4b7c909e019f8cc09a0d4495a5500fa
font_02_sfnt_off0001081a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1