Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ddf88002e867aa…

MALICIOUS

PDF

72.5 KB Created: 2021-06-14 01:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c9fa65e98968a8098fe69639ca02aa14 SHA-1: 3f09c4993903178c60fb28c52d6b7908ff85d4be SHA-256: 49ddf88002e867aa655e77ef4e23dba39cdc29ad2f3b73e1242de088b4c4387c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or SEO link farming. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, with one prominent URL being https://pistant.ru/pbw?utm_term=damaged+coda+piano+sheet+music. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/pbw?utm_term=damaged+coda+piano+sheet+music PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376857/normal_5ff90a4beed25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486033/normal_5fefdea986e62.pdfIn PDF document text
    • https://monivewuvafa.weebly.com/uploads/1/3/4/0/134096064/4679326.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380090/normal_5fdde7958ab33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424662/normal_5fe3b5a65867d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471464/normal_5fff6ea87041c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483097/normal_5fec33663145e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_601e6fc2b9006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451027/normal_5fe425bfc0a34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485801/normal_60b836d4bee5e.pdfIn PDF document text
    • https://sagisumofag.weebly.com/uploads/1/3/4/8/134882066/sunosizozilofigugiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485946/normal_5fcfe5f3ebb2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456676/normal_6032e65094515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421471/normal_604b43406ad44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481286/normal_6038d6bd52114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469641/normal_600aaec3c566f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471109/normal_5ffa870d271ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493876/normal_602c0716a5788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_60675e6aafa6a.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/bd9b6b8e-99ec-4743-91ca-d7d9fb09085c/waduxevumatunoxosaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95c621c0-4471-4837-99e8-035c9662cfe7/70606434820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42097602-665c-49f5-b17e-429988b43292/98505072452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d311831f-7e5f-48eb-9ae2-c42699eb5271/jizunoluwapebimofon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72054fef-83ec-4e67-aa30-0aa1a3d91e30/v_shred_fat_loss_extreme_for_him_reviews.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_off0000de0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0B 5360 bytes
SHA-256: 17bd21d63af733745263203cea59356157363721bd7297ba0136b07e4873d29c
font_01_sfnt_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 10684 bytes
SHA-256: 4ac52303385317452291530d8dcb29e8ef5a88775341d3707427b70123bf31a5

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