Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dca48d3376fc687…

MALICIOUS

PDF

85.6 KB Created: 2021-02-14 22:28:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 71df35cca6a4836ebc2974a551144714 SHA-1: 52b370901203b792bbbe1802658bccdcb4a35e60 SHA-256: 8dca48d3376fc6875f78b5bb7ea3e9c486d4a57d3fe0269c9bc9d761744e4501
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous URLs points to an attempt to redirect users to potentially malicious content, possibly hosted on domains like seumenha.ru or artrosil.xyz.

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 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.
  • 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://seumenha.ru/123?utm_term=ncaa+division+2+baseball+fall+practice+rules PDF link annotation
    • http://artrosil.xyz/awdhesh_premi_ke_bhojpuri_gana_djpv929.pdfIn PDF document text
    • https://dorakipep.weebly.com/uploads/1/3/4/7/134747047/fasujivux.pdfIn PDF document text
    • http://streichpack.online/accounts_receivable_balance_sheetjh5yy.pdfIn PDF document text
    • https://ramimuluvisefo.weebly.com/uploads/1/3/0/7/130775145/00b520f1cddd5.pdfIn PDF document text
    • https://mozesejute.weebly.com/uploads/1/3/1/3/131380505/guxit.pdfIn PDF document text
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/zozomulexulivezawek.pdfIn PDF document text
    • https://pameduvexeligim.weebly.com/uploads/1/3/4/5/134579292/4881747.pdfIn PDF document text
    • https://dekajemo.weebly.com/uploads/1/3/1/4/131453049/0e2e31ed5.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/haPhf6Q/slice_of_life_anime_movies_2019.pdfIn PDF document text
    • https://vipukawolatu.weebly.com/uploads/1/3/4/4/134486161/ae70c8bcc7e335.pdfIn PDF document text
    • http://bitcoins-profits.com/platform_number_5_cheadle_hulmehvi7v.pdfIn PDF document text
    • https://jukosixosibi.weebly.com/uploads/1/3/1/8/131871462/10212d49de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/97220850323.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/video_er_software_for_pc_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/5159131676.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/fate_go_reddit_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/17443784640.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/hufflepuff_uniform_scarf.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_off00010fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 5448 bytes
SHA-256: 5d1f79e3151445d3f83a1fcca5b0e1740ffc0ad41e10bd8952b68ed439df2eb0
font_01_sfnt_off00012258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12258 11204 bytes
SHA-256: c710280a74477ff388c63bce5d7e6f1a5f82de3106694ca46db4cd2cb4d3ab6e

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