Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda014807a37d984…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 03:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2c67b6ee0803a6eb742016abe3832b00 SHA-1: 4ec5052be41b97e5d88ddb674637b6ca9e6b3995 SHA-256: bda014807a37d984bbf693ca3e01142e8e32c756c94eda17428d7bfe58005e7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many of which point to disposable hosting or link farms, suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host many links on potentially untrusted domains. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=play+store+trends PDF link annotation
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425fc39e321---xubonakoposexagej.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/fotuzatoropekosofad.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/nitepimusetegopefikowumaj.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/jejenaro.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/7052298057.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/23249217004.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca4af0cea---74830887501.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/dukezuj.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/10753274658.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/82343299882.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/96147721818.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/fatokisasavepoxelew.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/41758789434.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/vivudepufuwid.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/litumebogo.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/kodesiguxepikodabusi.pdfIn PDF document text
    • https://nakshistudio.com/ckfinder/userfiles/files/98922904194.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/55279889732.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/waxujitafisanigopiro.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/88147002901.pdfIn PDF document text
    • http://santeh.md/img/files/lowokotaraxivufoga.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/65265239980.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/67928744071.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_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 10264 bytes
SHA-256: ae5c859890e51f772076ee369a6e1f07dc9095d101ce1f6dc23f8d22776da4a0
font_01_sfnt_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 17780 bytes
SHA-256: 0406c28143ee04cacd39822e376ceeb4eca8aaa118e18ecd7969fe286632565d
font_02_sfnt_off00012623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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