Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc19bdf3821b6ada…

MALICIOUS

PDF

75.8 KB Created: 2020-11-11 22:00:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddf51c7edecf271eca296b2e19ddba58 SHA-1: 1ea4e3c8cf07731852665e34d898968f67e65c1e SHA-256: dc19bdf3821b6ada0d7046c68ea382528d0521bd39a2caed0ae6e876f9436662
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafftec.ru/123?utm_term=memorias+de+mis+putas+tristes+pdf+espa%25C3%25B1ol
    • https://roxunasof.weebly.com/uploads/1/3/4/3/134312726/417505.pdf
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/5525885.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3355978.pdf
    • https://cdn-cms.f-static.net/uploads/4369911/normal_5f88c0b39f36b.pdf
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/6b98ca8f475.pdf
    • https://tuvozejuwubox.weebly.com/uploads/1/3/4/3/134323710/liwisimopa.pdf
    • https://pusinoki.weebly.com/uploads/1/3/4/6/134628586/734777.pdf
    • https://jaxobowes.weebly.com/uploads/1/3/4/5/134591409/2559784.pdf
    • https://dejaxunex.weebly.com/uploads/1/3/4/3/134318563/sixefujajimada.pdf
    • https://powofowus.weebly.com/uploads/1/3/4/5/134583567/lasabefadumu-nibigarikigoxa-dumarekovoz-getovitolade.pdf
    • https://mujonutuxow.weebly.com/uploads/1/3/4/3/134336111/d251dfee0e.pdf
    • https://cdn-cms.f-static.net/uploads/4444882/normal_5f9e95ff1f801.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/32984fa2-7dbc-4b95-b73f-ff74443255c8/14894479131.pdf
    • https://s3.amazonaws.com/rimejiguvif/no_lag_shaders_pack_1.15.2.pdf
    • https://s3.amazonaws.com/zuguvoxoki/33861829658.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda6.bin
096c63b146a62157f62b5bc457168b7436be49b3079bc691cd5792099711841b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 5404 bytes
font_01_sfnt_off0000efad.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 3720 bytes
font_02_sfnt_off0000fb10.bin
47561d45c0b3f1416ef5228a2d9d8e856574dac87413315cff8b400d5b58c869		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 11080 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.