Malicious PDF — malware analysis report

Static analysis result for SHA-256 502c9c275bbaee6e…

MALICIOUS

PDF

71.3 KB Created: 2020-11-19 07:19:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5b12fa23e1be73d1327c384990d2b2af SHA-1: 16da1daaabb5540a1838a51fede2768accf57bfb SHA-256: 502c9c275bbaee6e17aa7743a79c05f9144d2b7dfc62a5f387f0dc53658ccd53
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 0.9997

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://trafffi.ru/strik?utm_term=fundamentals+of+logic+design+7th+edition+slader PDF link annotation
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/sumoturulosex-xulegodab-fubumagetij-tazorexim.pdfIn PDF document text
    • https://tolixolosunep.weebly.com/uploads/1/3/4/4/134403343/3917698.pdfIn PDF document text
    • https://renesixedobalew.weebly.com/uploads/1/3/0/9/130969137/jeros-lizebepi-mogovadasenigep-falebeka.pdfIn PDF document text
    • https://vigejudekoseja.weebly.com/uploads/1/3/4/5/134518300/vawataxogu.pdfIn PDF document text
    • https://lesofetu.weebly.com/uploads/1/3/1/3/131378838/zilowagosabove.pdfIn PDF document text
    • https://molisemopum.weebly.com/uploads/1/3/1/4/131437834/mororuw.pdfIn PDF document text
    • https://bawimadesudife.weebly.com/uploads/1/3/4/3/134363746/f9bda93a9.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
    • https://uploads.strikinglycdn.com/files/79068082-06ad-4fbd-9180-c17e24ecb6bb/83672913972.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/algebra_1_inequalities_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/barcelona_walking_tour_map.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/hexagonal_prism_cut_out_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd30cf35-526d-4f81-85ad-b73eae101650/kadogazesunena.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB29 5352 bytes
SHA-256: ee38f9ce76eb2ba104151ebc7662dcaf220f78a1c537f5475cea5d0f893d9b5f
font_01_sfnt_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 10872 bytes
SHA-256: 2001e9849b290d1ee9d98579d75374617f80eebaeab13138b310a07779022f92
font_02_sfnt_off00010259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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