Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8303a31a1e6bae…

MALICIOUS

PDF

80.5 KB Created: 2021-06-07 12:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0628df98ea55dc694f06f071368acdaf SHA-1: bd9ec113da8de84a99f79a745004325e7711df66 SHA-256: 0b8303a31a1e6bae27b1c5572e865e7b310afcdd3b2bd98c55c57b002890057d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://druttle.ru/123?utm_term=benefit+of+building+information+modeling PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476436/normal_606510e73d739.pdfIn PDF document text
    • https://wanuwajazil.weebly.com/uploads/1/3/4/8/134899981/nakigivisanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426701/normal_6042ed5abf1d3.pdfIn PDF document text
    • https://bupulaserora.weebly.com/uploads/1/3/1/4/131437689/d8b6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415739/normal_5fdfd0712e8d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462075/normal_603aac7f35e3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_603f8cb1c0623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450516/normal_60b905eaebc4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387031/normal_5fdcffcdc6a82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458833/normal_604a8c1ec3eb9.pdfIn PDF document text
    • https://fofonameg.weebly.com/uploads/1/3/4/5/134522304/3618802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386824/normal_60556f7d46484.pdfIn PDF document text
    • https://wusuritod.weebly.com/uploads/1/3/0/7/130739885/ab7c565006.pdfIn PDF document text
    • https://xavixikani.weebly.com/uploads/1/3/4/5/134502132/472695b545.pdfIn PDF document text
    • https://bawokuxuduxiv.weebly.com/uploads/1/3/1/8/131856062/e40bcf2a.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/d75707bc-92c7-45c5-9652-7be7ace68a3a/bijaparaxinodufesibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15908043-61c9-41b6-a66d-4f6870f726c5/lista_de_palabras_enlace_para_mapas_conceptuales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90bfca7e-4214-49bf-8b2f-39206b1e1b18/why_is_my_heating_blanket_flashing_f2.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF04 5240 bytes
SHA-256: a1bc8ae1ea4971acf00220a20c34add87092fcec3b35a9c77f86097ea477a27c
font_01_sfnt_off000110be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BE 10520 bytes
SHA-256: de51b0c47d82bb4cc4f150d732e69f07ca7c90412bb518b314f99982713fc6b0

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