Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e176dcb459c7a31…

MALICIOUS

PDF

83.4 KB Created: 2021-02-18 11:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1cacb5cf375c13499506468d8724d791 SHA-1: a3a6f4aa8e4053577b3421ddd592bdf8bfbe05e3 SHA-256: 9e176dcb459c7a31fe1e5e9a2d7ceddecbbc8f8a591412e3a106f39bb6e5d21f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of many external URIs suggests the document's purpose is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://crophysi.ru/strik?utm_term=ejercicios+de+limites+funciones+trigonometricas+resueltos PDF link annotation
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/1ad19f631.pdfIn PDF document text
    • https://dukopovofozevi.weebly.com/uploads/1/3/5/2/135295758/8234689.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495055/normal_5fc70e24edd59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486060/normal_5fd2f4c26c7f0.pdfIn PDF document text
    • https://daviwajid.weebly.com/uploads/1/3/4/6/134609730/gexufonowe-bojefe.pdfIn PDF document text
    • https://sodapovi.weebly.com/uploads/1/3/4/4/134494820/bewosanebimoka.pdfIn PDF document text
    • http://a1metromovers.com/25024001796zfpfa.pdfIn PDF document text
    • http://omynutural.space/honda_crv_radio_code_errora2fb8.pdfIn PDF document text
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/d1f9670e59d0c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383800/normal_5fd1ad9794fc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377379/normal_5fd627d705b8a.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
    • http://pulawev.epizy.com/vande_mataram_song_free_320kbps.pdfIn PDF document text
    • http://sexikajizetux.rf.gd/does_walgreens_have_fedex_boxes.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/west_african_mask_template.pdfIn PDF document text
    • http://lakuxizutigevo.rf.gd/58776064194.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/rakafulak.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/wawexusidisa.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/2005_chevy_trailblazer_owners_manual.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 5256 bytes
SHA-256: 22811c8c4f4719db7c7b1ccb2b120b92b8e1689ae9b3de32bb3f341366089808
font_01_sfnt_off0000fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 1956 bytes
SHA-256: 7c04bd7deeb11cdf7478c5ef593735c7fc22ac6759f279761b1d90d503580837
font_02_sfnt_off00010693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10693 12572 bytes
SHA-256: 300ebc713628853a3f3655afbaebd18fb97cadbaf297cf2608c04f3ac4e0ff75
font_03_sfnt_off00012f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F96 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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