Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d9776996aaa7ed…

MALICIOUS

PDF

76.5 KB Created: 2021-03-04 22:31:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 48b12720f3d5e2b47e5abdef66013b6b SHA-1: 5bc0e283caf0cf3525392082b3df080cb9da5a0f SHA-256: f4d9776996aaa7ed9b221944ef53e8b0591c6790f51f222f1e6781ed3603d843
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 0.9995

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://dugedepap.ru/award?keyword=attack+on+titan+cast+season+1 PDF link annotation
    • https://nirulutot.weebly.com/uploads/1/3/4/7/134700174/naronewax-fiboz-bogawezokib-jopudo.pdfIn PDF document text
    • http://lolkek.xyz/husqvarna_hu775h_air_cleanercog6s.pdfIn PDF document text
    • http://secureappeal.com/12126668993bw3bu.pdfIn PDF document text
    • http://luminar4-download.xyz/lusters_comb_thru_texturizer_instructions3hgv2.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/famokedupo.pdfIn PDF document text
    • https://gedesinikus.weebly.com/uploads/1/3/5/3/135323437/4229602.pdfIn PDF document text
    • http://konsalting.info/938928639440v5x1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409236/normal_5fdfb17738e8e.pdfIn PDF document text
    • https://dorixakogika.weebly.com/uploads/1/3/6/0/136051108/b5bfe2235414e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382770/normal_602ebf8793fe6.pdfIn PDF document text
    • https://rilopogikumifo.weebly.com/uploads/1/3/4/3/134320310/dilonapuzul-bimegosudaduge-vonubutox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_600eed5f6e4eb.pdfIn PDF document text
    • http://enots.space/usage_of_semicolon1zibi.pdfIn PDF document text
    • https://mujamixoto.weebly.com/uploads/1/3/0/7/130776872/83288.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376372/normal_60285b2d6c36d.pdfIn PDF document text
    • https://vaxovuxaso.weebly.com/uploads/1/3/3/9/133997441/7255607.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461216/normal_6004ab9bf3228.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389085/normal_5ff77009c62c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455208/normal_5fdbe57ca71a1.pdfIn PDF document text
    • https://saxeguwub.weebly.com/uploads/1/3/1/4/131406831/dunawamowefat-luzusanulu.pdfIn PDF document text
    • https://pegiromilu.weebly.com/uploads/1/3/4/6/134683304/6027508.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tafiwepamubov.atwebpages.com/pikamolalaluvonufud.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_off0000f1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 4768 bytes
SHA-256: 6c1b8ff024b19dbf572af3e2f9f2511f8333ca1814ff60e62993c54127928021
font_01_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 10080 bytes
SHA-256: 8f3c6f2534a191a53c8e26396ec69aec2803df9a721659e0c9a593f0205185ee

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