Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c28ce3eea135366…

MALICIOUS

PDF

71.3 KB Created: 2020-12-20 12:42:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 650238cdd3ef71c18040b3aeaa214f01 SHA-1: dbf6348925c5492b001ff5decfbada95b69d9b6b SHA-256: 6c28ce3eea135366d17500fd91222d835eb6685031b191dfd34139b2a11a4e34
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://traffnew.ru/strik?utm_term=off+armageddon+reef+pdf PDF link annotation
    • https://femodufawo.weebly.com/uploads/1/3/4/3/134317846/d3d0970be9.pdfIn PDF document text
    • https://bejivuvepezera.weebly.com/uploads/1/3/4/4/134437422/3147492.pdfIn PDF document text
    • https://xapilupu.weebly.com/uploads/1/3/4/7/134709440/6201164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476443/normal_5fc24cf127f11.pdfIn PDF document text
    • https://nigikejogu.weebly.com/uploads/1/3/4/9/134902550/patitugetom_geremosavedepo_vovuxotam_fobufugefejebaz.pdfIn PDF document text
    • https://roriwemako.weebly.com/uploads/1/3/4/5/134599113/0f797894fe09.pdfIn PDF document text
    • https://kixovomez.weebly.com/uploads/1/3/4/8/134868331/zumanoniduve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411681/normal_5f94a5017ddc4.pdfIn PDF document text
    • https://dodevapamoj.weebly.com/uploads/1/3/4/3/134352329/1413563.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/a0c04df0-d55c-4783-aa9b-6ee09e872be1/network_interface_card_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/198cacf6-5581-48ba-9c70-f7a1ad7cfd20/44664975918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf1298f0-b415-4042-b03c-a5b48fbcdbdb/airtel_3g_dongle_installation_softwa.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/carlos_castaneda_relatos_de_poder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fc1f7cc-4af7-48b0-8736-fbd85ffe8b16/44019141958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02729389-1428-4877-a7bd-98002c23311d/19754037636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a73eb6-84bb-46c2-919a-3a2ce2919e17/cub_scout_wolf_requirements_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4baa3f8-9408-4db9-b7e2-5f5430126881/nodozekirumokuz.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/77147067601.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_off0000dad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 5176 bytes
SHA-256: 23de8f48d0ca1955c7c611f4ea3a2c7b6185dfd9e6b97f0b19ba6fb6b8c42842
font_01_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 10672 bytes
SHA-256: be281827b341cd9f79343db0335f8db89ea7746e9e9a734303043a8db0d060e7

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