Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c17107cfe7d35da…

MALICIOUS

PDF

80.4 KB Created: 2021-03-01 13:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 87bb0a58a660e96f3b21083b76aa947b SHA-1: d994648f24979bd5f2397f5ea0bada618121920f SHA-256: 9c17107cfe7d35dab4efe21aa95e4ee17fc33e517220d7852508f7cbac162b24
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The embedded URLs, such as 'https://jacksth.ru/award?keyword=how+to+take+out+atomic+mass+of+an+element', are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=how+to+take+out+atomic+mass+of+an+element PDF link annotation
    • https://kagozekexep.weebly.com/uploads/1/3/5/9/135956698/8a9545f1884.pdfIn PDF document text
    • https://tibijipobarak.weebly.com/uploads/1/3/4/4/134493900/c1a47cb4c5d.pdfIn PDF document text
    • https://mogeletonedilo.weebly.com/uploads/1/3/1/4/131482944/ba90391a.pdfIn PDF document text
    • http://axecheat1.xyz/beluwosivesenoxebtxev3.pdfIn PDF document text
    • http://bigojojodun.iblogger.org/latest_cpr_guidelines_australia.pdfIn PDF document text
    • http://wonnaturila.space/gay_porn_myvidsterj6jgl.pdfIn PDF document text
    • https://zekilunadaxidub.weebly.com/uploads/1/3/4/6/134631079/leluxupak.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/515b307.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/dutimajizowa/tax_form_for_sale_of_farm_land.pdfIn PDF document text
    • http://fajubumejuxuful.rf.gd/what_does_knowledge_based_economy_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/57951031731.pdfIn PDF document text
    • http://pewozemiludex.rf.gd/475557231.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/synonyms_and_antonyms_worksheet_for_grade_3.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_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 5048 bytes
SHA-256: 0bf23f529506d0592f3de6ee175191f903e8470bb68fc76be0e91e642efceaf6
font_01_sfnt_off000106e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E6 14580 bytes
SHA-256: f961b6688b9448bcbe2734f658937c2037e103718b6a529994ba57393c2b6200

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