Malicious PDF — malware analysis report

Static analysis result for SHA-256 655aebd26a18d459…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 21:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8fa912c4166f008e3e107f923f77d1ea SHA-1: f90f8cca09c609557288a280eab371c514c83a0f SHA-256: 655aebd26a18d4594c00891b3eba84fd4d99d73d1b6416b84b419158698d7902
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM, indicating a likely attempt to distribute malicious content through a network of disposable links. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://tahitotfaluovodak.hu/ckfinder/userfiles/files/31921390770.pdf In PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/kivozubisizafozez.pdfIn PDF document text
    • http://unseretochter.ch/images/file/kisuxubujajamo.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/duzizesinidinefitani.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/tififugi.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/dexinomebonituzazekozitej.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/97700624191.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/76300362134.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/77984537589.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/27381468229.pdfIn PDF document text
    • http://infracsap.hu/files/file/rororiwiduvoluv.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/letawupu.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210902043634.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/25240329389.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://lab4050.com/upload/editor/file/84787773082.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/wozidojitulawufewur.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/56779361323.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2c3cd0f52---suvepawaguturusofiv.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0fc0c48e2---rovidowolitedowe.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/wubazaxetutixir.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/78391253778.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/vumedakuju.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/60354708206.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/nuzugebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=xiaomi+redmi+9+led+notificationPDF 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_off0000db0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0E 18764 bytes
SHA-256: 90f68c5b2d51f2883976ef23e5ba9ef73bd7bb2f4b8a5cd7eb193173f78edad5
font_01_sfnt_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 10644 bytes
SHA-256: e98743a9431389bccfa1a18d7b5d1bb9fd3b7a78eceaddd83342182482ff4b7a
font_02_sfnt_off000123e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1