Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc30617b16e3477…

MALICIOUS

PDF

81.7 KB Created: 2021-10-14 14:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0acd1683fca89760e0a19a469aab53fd SHA-1: d7b5fb6cc9ae482ffee8b2baa068f99a87ef95d1 SHA-256: abc30617b16e347744c6c8d338a6f1b7474afe566f74c44c149bf3ee8bec65b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://vipacademy.org/userfiles/file/kuxum.pdf In PDF document text
    • http://studiocinti.eu/userfiles/files/danilarawunokigejesi.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/91161577014.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/27778822817.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/puxunimafuvefa.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/34062832117.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/rugogugagejetegomuteref.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/41503258258.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/42926780465.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/xopulalaja.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/wetamevasubapi.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fd1ea78debb80550aab3b785b784e024/5248852166.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/foravulosalimawepupalanuj.pdfIn PDF document text
    • http://attlas.center/userfiles/file/90842626074.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/xumabutamagot.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/46317757079.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/metewuroni.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/tipavagopojudojikudiwa.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/zebenikafi.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/jufafunigija.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/87489949076.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/webarozewafobivesuvazim.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/16706470755.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/vorabazusifuvejixuroveg.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210902110940748886tgpoyg2kg0rm.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/KGDyd8lM0uI/uplcv?utm_term=etymology+of+answerPDF link annotation
    • 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_off0000d831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 19056 bytes
SHA-256: 752585089555f2bffc0a8ef6fa92098c17a210f89e6089f43f90b9592dd9708e
font_02_sfnt_off00012116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12116 10648 bytes
SHA-256: 72d159a07cd914921ac025b69aad57efad3605d69613ec779c671ae903395fbc