Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c3b226f8dc5aa7…

MALICIOUS

PDF

77.4 KB Created: 2021-05-28 09:40:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e5243f29f8bce61d66776c9370134358 SHA-1: 49dd8e0986dffe73481aab8899ca30de4ada8074 SHA-256: f2c3b226f8dc5aa790bd33bd73d311e5ec114e88b9a88898336b46ead02bde36
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to redirect users to phishing sites or potentially host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=adverbs+list+a-+z+pdf PDF link annotation
    • https://nuzefamulazoxiz.weebly.com/uploads/1/3/4/5/134582777/vogabofin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_601476762870e.pdfIn PDF document text
    • https://duzamalati.weebly.com/uploads/1/3/5/9/135986709/8682257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385197/normal_60141889abe5a.pdfIn PDF document text
    • https://xijoxipuxob.weebly.com/uploads/1/3/4/7/134704834/7749661.pdfIn PDF document text
    • https://betisifi.weebly.com/uploads/1/3/1/4/131438474/vagexanav.pdfIn PDF document text
    • https://xogosafaxisomig.weebly.com/uploads/1/3/0/7/130739024/fibudos-pomukani.pdfIn PDF document text
    • https://ninadagonalot.weebly.com/uploads/1/3/4/6/134668818/faderapiwevaxokexagi.pdfIn PDF document text
    • https://durapafived.weebly.com/uploads/1/3/1/4/131438767/xifinatozeda.pdfIn PDF document text
    • https://nebegixemavo.weebly.com/uploads/1/3/4/3/134359619/giturofozuzobux_gigomap.pdfIn PDF document text
    • https://fewabobur.weebly.com/uploads/1/3/4/7/134713859/madesojogokedisewod.pdfIn PDF document text
    • https://tumekisegazuf.weebly.com/uploads/1/3/4/6/134611428/nolawowabadagob.pdfIn PDF document text
    • https://misirukizos.weebly.com/uploads/1/3/4/0/134017349/sabuzuzuxike.pdfIn PDF document text
    • https://jivimukik.weebly.com/uploads/1/3/0/7/130775904/6308337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465559/normal_60207a9a147e4.pdfIn PDF document text
    • https://zefowuji.weebly.com/uploads/1/3/4/0/134096403/feros.pdfIn PDF document text
    • https://loruwowawerer.weebly.com/uploads/1/3/1/4/131483348/vefivajefisoniba.pdfIn PDF document text
    • https://vupafoteb.weebly.com/uploads/1/3/7/5/137509526/47a43634fc.pdfIn PDF document text
    • https://nivojekegup.weebly.com/uploads/1/3/5/3/135322075/7f37bf19421.pdfIn PDF document text
    • https://tiwokixaxuvap.weebly.com/uploads/1/3/4/2/134235176/lotagodiba-zoketev-xibom-betelobubefew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 5304 bytes
SHA-256: e1f5de7f36973341bb969569fd3a528448206a936f3e9feb43697ba743f76a0f
font_01_sfnt_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 10720 bytes
SHA-256: dcfe13a74aa3dabe1e1d3b272130653746aa0d2a2850047794432a571b2d2116

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