Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99ca3fe2d299f18…

MALICIOUS

PDF

68.1 KB Created: 2021-05-15 23:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 29dfd5bebb85c944a8a5e3165dd1f1a2 SHA-1: 73bb6f664137ca2050d2fcbb0b1d191677dff05d SHA-256: c99ca3fe2d299f18d1bfd38672ca4933eee47d5ec2272ec8160bc09b84a40bc5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://xezojetit.ru/strik?utm_term=what+is+the+name+of+the+chlorophyll+a+at+the+reaction+center+of+ps+ii+called PDF link annotation
    • http://lidlid.xyz/motorola_xpr_7550_factory_resets8ukp.pdfIn PDF document text
    • https://jetezoxow.weebly.com/uploads/1/3/1/3/131379231/1851a.pdfIn PDF document text
    • https://datedevob.weebly.com/uploads/1/3/1/3/131381982/suvuriveba.pdfIn PDF document text
    • http://siondez.ru/salotinuad3ew.pdfIn PDF document text
    • http://expressvpn.store/gluten_free_snack_ideas_for_toddlersj6ug0.pdfIn PDF document text
    • https://xumomeroruv.weebly.com/uploads/1/3/4/2/134266579/dibisalodubo.pdfIn PDF document text
    • https://vajilitoseg.weebly.com/uploads/1/3/1/4/131437648/6504327.pdfIn PDF document text
    • http://pejelurim.getenjoyment.net/65288693626.pdfIn PDF document text
    • http://grantmedica.ru/lofijebisikidafabegenfu790.pdfIn PDF document text
    • https://jikuvubavul.weebly.com/uploads/1/3/5/9/135964228/demamute-vulalozinemito-bubexi-nepiforinidep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad11a1f1-737f-4419-823e-32f90d2bff39/pikaririwokepededanajew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56510d8e-4297-4e80-9fdd-a3c75a7c47d1/program_genie_garage_door_opener_to_cadillac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c037150-cb8b-403b-b8e8-5637ce46f146/9865231124.pdfIn PDF document text
    • http://wenibeliso.atwebpages.com/garemorenekunowidadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a352dd-dd02-49cd-b427-0bbd0513c77b/zen_and_the_art_of_happiness.pdfIn PDF document text
    • http://zewadomi.myartsonline.com/furofaxisivunafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cddf179c-1024-4b7e-b308-263d7499d238/the_summary_of_the_poem_kubla_khan.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCE 5508 bytes
SHA-256: c93e19ba860d0d9e4bd1b60bba79e25b4adf001bada799c8a26004195ec59153
font_01_sfnt_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 10204 bytes
SHA-256: 0a07ddc372a963d00a6d0b3d43f9fd05b02c2f3f3e8a6d3da5a52696b09337ca

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