Malicious PDF — malware analysis report

Static analysis result for SHA-256 478a92f46a70d53b…

MALICIOUS

PDF

72.7 KB Created: 2020-12-14 17:22:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f5cafad302e939a860f8fcb3dc8949f5 SHA-1: 60e7db961e87823099a9e9a4ebbb07317c014abd SHA-256: 478a92f46a70d53beb4abfa3df34849d6245ac561d65ce6c85f30b7ba6d4c59b
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://trafffe.ru/strik?utm_term=calories+in+dunkin+donuts+coffee+cake+muffin PDF link annotation
    • https://meverofukibax.weebly.com/uploads/1/3/4/6/134620555/a8efd72972581.pdfIn PDF document text
    • https://dusuganot.weebly.com/uploads/1/3/4/3/134358603/2ef9045.pdfIn PDF document text
    • https://sezariserafuf.weebly.com/uploads/1/3/4/6/134673330/bb236659.pdfIn PDF document text
    • https://tusefekojeseto.weebly.com/uploads/1/3/4/4/134437698/mukomoge_nesabamupuzo_gowob.pdfIn PDF document text
    • https://murudogukezopo.weebly.com/uploads/1/3/4/3/134320821/zomaduwevijul.pdfIn PDF document text
    • https://fugomunufu.weebly.com/uploads/1/3/4/5/134586131/buvufijola-lipewulum.pdfIn PDF document text
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/pikuwan-navixoxazep-vusevenuzanefo.pdfIn PDF document text
    • https://rafulosuzeme.weebly.com/uploads/1/3/4/2/134234553/bijisugijoz.pdfIn PDF document text
    • https://sagoxanoku.weebly.com/uploads/1/3/4/3/134350044/desobazuberulawamo.pdfIn PDF document text
    • https://keziripar.weebly.com/uploads/1/3/4/5/134522929/662e2c8b46c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454430/normal_5fb67dbf5c641.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_5f8fbc4aeea7f.pdfIn PDF document text
    • https://xexegetogud.weebly.com/uploads/1/3/4/3/134375989/425ad144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409107/normal_5fc342c411870.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/5d3980a1-5027-453f-9e9e-7f3885ae8b81/suzuki_atv_owners_manuals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39227695-caf5-4cd9-b83c-e460c4bedfa0/pizazupefunum.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A5 3196 bytes
SHA-256: 9ed9c31890cdd00ce93777853e56f63f7dd221064f0938c6811be17a16cf11c0
font_01_sfnt_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 5136 bytes
SHA-256: 712034da577838a3fd962fed2585808ecae7a37273009e9d08f29dc46a47d484
font_02_sfnt_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 10692 bytes
SHA-256: 2e49478ddb67023d457fe53925f5b5edbfab8ea69f28cb13758419687dd6c99c

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