Malicious PDF — malware analysis report

Static analysis result for SHA-256 64126a98421efdc7…

MALICIOUS

PDF

65.5 KB Created: 2020-12-16 19:27:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8aea839733c2a41366f4f61d14336af1 SHA-1: 92508b3faf620e89b34d59417b6525ecab12961b SHA-256: 64126a98421efdc74bae09b3421a9a2de87963ac45bded0952dd9112f31afb56
186 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 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://trafficel.ru/strik?utm_term=ice+cream+packaging+mockup PDF link annotation
    • https://xexezakofiwojuv.weebly.com/uploads/1/3/4/3/134372147/39a1175.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501810/normal_5fc8a46cccb7b.pdfIn PDF document text
    • https://rotowuvusokij.weebly.com/uploads/1/3/4/8/134884207/4819114.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/giveka_dimiti_kubunududifagi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446507/normal_5fa093d971b2f.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/404244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425217/normal_5fc1c9ef0f9a7.pdfIn PDF document text
    • https://fekugutupufug.weebly.com/uploads/1/3/4/8/134876907/bejatugijoguxo_moxorosoti.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/90016a7869bed.pdfIn PDF document text
    • https://fajubixinusejeg.weebly.com/uploads/1/3/4/8/134850070/wipebuz_netujelazijebaj_xemogapenizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415531/normal_5fa2fb9a4a419.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/4ea18d37-ab3d-4ca0-b967-0515905f83b1/sisilikegabozu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfcd6f403f5353fd8f68b6/t/5fc1140e4e98326c02367abf/1606489103043/warframe_lex_prime_receiver_farm.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd14cb803f460880cc14d9/1606227148389/law_of_conservation_of_mass_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/507d8a1c-3ee8-4713-9842-289a75771181/bubuxitaxeles.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_off0000c464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC464 5044 bytes
SHA-256: 5340c856550e419c107a4f8484a3c2742d7771589507b2a44731f348cf7d1879
font_01_sfnt_off0000d578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 10556 bytes
SHA-256: 4fe52d5ef88adee148b0aeacce3141f9b82b591a9d7a2764e9db8acf5c1ecf64

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