Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fda9828356334a…

MALICIOUS

PDF

73.1 KB Created: 2020-11-25 03:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 241fd60016978e2bb0882be7fe8d1c33 SHA-1: d89a94c53636d35c5cf7b4b3632de56f8543570e SHA-256: 77fda9828356334adf0ae679ab698aed1ab62aa05d637ad95993be160d688cc4
156 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 5

  • 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.
  • 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=what+object+class+is+scp+096 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404287/normal_5fb3fbbb3a807.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/pinow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480756/normal_5fae89f39a163.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/tizedeniluxiz-gefowigujotubu-senunomikale.pdfIn PDF document text
    • https://vuwisirikufav.weebly.com/uploads/1/3/4/7/134765545/316f641.pdfIn PDF document text
    • https://xotukejurivaj.weebly.com/uploads/1/3/4/0/134016857/wozid.pdfIn PDF document text
    • https://nukewixe.weebly.com/uploads/1/3/4/3/134385223/wufex_foxitanetufet.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/dbe2816b-a082-4234-abf3-03f50082ce50/use_magicjack_with_google_voice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e09801ee-0473-44a1-bf3c-204c232f4840/41824234060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb888aa-0bd1-4af2-ae8f-d25dc7b30374/37524286345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/813aca47-14fa-46b3-891f-687bdeb3bfb9/29559756533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a71285a-842d-4a66-9eb0-56710329241c/50552779051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fca3296a-14bf-4a12-86ce-81c270e565df/75215067657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d64cc40b-d6eb-4d91-bfca-f4d2571b0b08/las_ciudades_invisibles_analisis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f32b258-7ca7-4b29-93a7-f9ef078911f4/tepuguwobapaserubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf92659b-c54c-4c2a-9da2-05ad178d9b48/18795397913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/798ba3c5-b981-4378-ae34-9b6ae4072aff/bijobuwizaji.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_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 5604 bytes
SHA-256: d829ad86499f4e7054039b37cf69c0166bb9f65f800e873573d1d6880d9f9f80
font_01_sfnt_off0000f11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 11060 bytes
SHA-256: d3c85d2698dedeeb7fcc52d0f7bcfbac1f408a190876db8fbbce855dd8f34cdf

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