Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ebca98e8aa08bf6…

MALICIOUS

PDF

78.6 KB Created: 2021-05-29 16:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aee2cb17ff22dd06e0d65610e3514d8c SHA-1: ea7ab7da22ab1cfd2eb27de5386d4d0711019fc1 SHA-256: 0ebca98e8aa08bf633ccb3702d03e018ecd21f83e611dca2131b19d816e6993d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services and appear to be part of a link farm. The primary URL, 'https://resalured.ru/strik?utm_term=apostila+com+todos+os+acordes+de+viol%25C3%25A3o+pdf', suggests a lure related to guitar chords, but the overall structure indicates a phishing or spam distribution mechanism. ClamAV and ML classifiers also identified this file as malicious.

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://resalured.ru/strik?utm_term=apostila+com+todos+os+acordes+de+viol%25C3%25A3o+pdf PDF link annotation
    • https://josozigigararu.weebly.com/uploads/1/3/2/6/132681886/f7a1982a0b5ad4.pdfIn PDF document text
    • https://pavuxutekukos.weebly.com/uploads/1/3/4/7/134704216/7316990.pdfIn PDF document text
    • https://wizejuxexena.weebly.com/uploads/1/3/4/6/134655833/91faaf.pdfIn PDF document text
    • https://momitoxen.weebly.com/uploads/1/3/7/5/137514133/kokamapixufe.pdfIn PDF document text
    • https://sogegagep.weebly.com/uploads/1/3/4/6/134687839/koneladu_fimesafan_jubebunobi_vojesuxo.pdfIn PDF document text
    • https://poxofosu.weebly.com/uploads/1/3/4/3/134308827/fafopuxaw.pdfIn PDF document text
    • https://vinovubetiloj.weebly.com/uploads/1/3/4/6/134679092/morakodebo.pdfIn PDF document text
    • https://vunusamonumated.weebly.com/uploads/1/3/4/0/134040658/kajilogolawapud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_6048ec7a358bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_606ea3ac0d7f3.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/ba125ec9-bfe1-4951-87f0-1feb1a2ef0cf/pedarafix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15059a02-6b81-47f2-bc8b-9ed907a44f5d/23894332593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d29b66d-c2ce-4d3a-bdfe-2fc684f7d772/trane_xb80_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49eaf0a1-fe7b-44e2-ba3e-27b327286d07/jukajusadamoregapik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0091ee6-4d84-41f0-a6d9-e859729e519b/tubod.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_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 5668 bytes
SHA-256: 40a6b6228da5905b180d07e769ebdc311b4f0320b112e80443d9e5fd53b926ef
font_01_sfnt_off00010441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 12492 bytes
SHA-256: 8fd0e92d0016d7c2523d840b377cf604837a1066481a478ffaa14500621f646f

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