Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8caa928ce1db74d…

MALICIOUS

PDF

74.1 KB Created: 2021-01-26 10:43:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 59cad27016ca2c3407c739ec565e1f93 SHA-1: d2ee877ef5c29e192a0f1f52ea818784f3a3db06 SHA-256: b8caa928ce1db74d29b63f5baff7c5319232f3a4d84212207ac31fe1b8a569c8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs pointing to external PDF documents hosted on various domains. This technique is commonly used to distribute phishing content or further malware payloads. The presence of multiple disposable hosting domains and UTM parameters suggests an effort to obscure the ultimate destination or track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=pine+creek+gorge+state+park PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381737/normal_600b8e350e33a.pdfIn PDF document text
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/6568791.pdfIn PDF document text
    • https://funavekun.weebly.com/uploads/1/3/0/9/130969801/9675420.pdfIn PDF document text
    • https://dupujemewo.weebly.com/uploads/1/3/4/0/134040979/nakilajel_ruwalef_xowur_woduxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459468/normal_5ff46509d2d43.pdfIn PDF document text
    • https://xexonukomamub.weebly.com/uploads/1/3/4/3/134353621/rixiz.pdfIn PDF document text
    • https://fogufufizanalu.weebly.com/uploads/1/3/0/8/130813948/df2a1e.pdfIn PDF document text
    • https://fakedowekiz.weebly.com/uploads/1/3/5/3/135314463/7419950.pdfIn PDF document text
    • http://energierecrute-emplois.com/cancel_auto_top_up_o23b5sh.pdfIn PDF document text
    • http://airbin.top/fastest_diesel_tune_pro_series_drag_racing4mubf.pdfIn PDF document text
    • https://wugedelujexot.weebly.com/uploads/1/3/1/4/131456191/xisumeka.pdfIn PDF document text
    • http://galoomer.online/best_buy_ps5_launch_day_pickupho76b.pdfIn PDF document text
    • http://remastacer.com/tixuxulexemivosuwudome6ibfv.pdfIn PDF document text
    • http://8gusevshop.space/dekifubidoxamimimapu7rmq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426966/normal_5fdda0168d473.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 5132 bytes
SHA-256: 1eb41ce45813d71f1355af076af5d66219393bbe00767d2e9cf09fe556821592
font_01_sfnt_off0000f53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 11252 bytes
SHA-256: 7684b3fe39d42a1079c8fc0059a41b48238193900832596c799eb4b35c92cb5d

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