Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5cabceeb416b9e…

MALICIOUS

PDF

90.7 KB Created: 2021-05-24 22:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 71bd91c9234a242df96d064d276e23b9 SHA-1: 85ec6e7aa0ceea6eb43ce9309bcd01f70990bac3 SHA-256: 8c5cabceeb416b9eba2315fedc450a43acc97e078152a9824f964d81ae9f137c
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/strik?utm_term=disadvantages+of+stakeholder+theory+in+corporate+governance PDF link annotation
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/1f7b371e3a53f2.pdfIn PDF document text
    • https://silavetej.weebly.com/uploads/1/3/5/3/135314504/3da19e69d187d7.pdfIn PDF document text
    • https://xiboraritaro.weebly.com/uploads/1/3/4/4/134464700/8635761.pdfIn PDF document text
    • https://jugizefabugej.weebly.com/uploads/1/3/4/3/134377355/9093198.pdfIn PDF document text
    • https://xulozajewe.weebly.com/uploads/1/3/1/3/131384688/5bacc46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481424/normal_6046d9ad349cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483346/normal_600ef8663f2ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393521/normal_6051eebf87c8d.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/16c317f1-c3d9-450b-9e75-a25ce35bc2d7/classic_fairy_tales_jack_and_the_beanstalk.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/bulk_sms_app_for_android_phones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5af87fe-c379-461b-bddb-a5eb2fc1cd3e/powerstroke_2200_psi_gas_pressure_washer_oil_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/828bbc4c-42c5-4326-8bfd-291caf460fab/48958174823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2d9f1f0-94c4-4b8c-b142-8c23ca60557f/the_lucky_one_book_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/formula_for_volume_and_surface_area_of_all_shapes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4dad8af-f627-4b23-ac5c-a9224d14a578/muludatubeli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/487239d7-3b34-4d22-922f-a3ff68ddbc99/mailing_standards_of_the_united_states_postal_service_domestic_mail_manual_dmm_609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d4db599-1551-420a-8aa7-c0825cc47440/optiplex_7010_launch_date.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12409 5640 bytes
SHA-256: deabe2fa711fcb01b9388b895a374c2cdd7c4135564ff766600d2b007094cced
font_01_sfnt_off00013756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13756 11120 bytes
SHA-256: 56da36a39d0f779d9c3b8a1db5fb8fb08eb441ff8b62b8980cfd2f3191e6f1ea

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