Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dec0fe246d48355…

MALICIOUS

PDF

77.0 KB Created: 2020-11-13 19:01:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 47ec5f00edfb1d8bc05bb28438f02388 SHA-1: 0d287e7b9b7f0f4bc3976be44fb3206565744434 SHA-256: 3dec0fe246d48355756c2dae3cdbad05703c3ec834dc9f561c04a91e05fdf09a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary external URL observed is 'https://traffset.ru/123?utm_term=radiant+wall+mounted+heaters', which is likely part of a malicious link farm. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing or trojanized PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffset.ru/123?utm_term=radiant+wall+mounted+heaters PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373259/normal_5f8eac06eac2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5f889b86c4333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421218/normal_5fab9d039f5de.pdfIn PDF document text
    • https://misopiwulasi.weebly.com/uploads/1/3/1/8/131856666/510b09456a898f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dujepav/57317201626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa157b43-4dd9-4f82-af05-20cc7b9f075a/rerujetago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7719313-b777-4ec0-ba5d-527fb8f7f05a/somikimusafenexi.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/wuwawuvesosefesexezuk.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/2624871884.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/fseconomy_vs_onair_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/educational_technology_2_lesson_3_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/najisiboxoriz.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD64 5044 bytes
SHA-256: 175ff0578bddeb0e3610d3bea892c9c94e345e5e0c4195a17d3aed51ed405922
font_01_sfnt_off0000de64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE64 11412 bytes
SHA-256: 84b5bea670bb2f86a4492fa6812033f10af6c5b71a2928e6571cb8014c246db5
font_02_sfnt_off00010441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 16064 bytes
SHA-256: ffad8dbc339acf9f6a7b1c1b901d719cd2bc945b1b13bfb8173beab322595c47
font_03_sfnt_off000118d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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