Malicious PDF — malware analysis report

Static analysis result for SHA-256 a061c3c5e4037061…

MALICIOUS

PDF

76.5 KB Created: 2021-02-24 00:32:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d73d3ada10e84b13219ce37ef3a12990 SHA-1: e4449f86d9235bcb5bb25dbf8f38c9508c6a23e0 SHA-256: a061c3c5e4037061eb8119fbea784de87f3feec9cc65d25f69e15be2c7f6c3f4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a phishing/malicious document. It contains numerous external links, many pointing to disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://maypoin.ru/strik?utm_term=how+to+use+shark+lift+away+professional+steam+mop PDF link annotation
    • http://aarbuz.space/332424867192wpj8.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/83ygihi/best_slashing_badges_2k21.pdfIn PDF document text
    • https://wifamiwipefap.weebly.com/uploads/1/3/0/7/130738562/pejifegulenewe-fovojolelurike.pdfIn PDF document text
    • https://cdn.sqhk.co/kadunila/f1grheT/kanto_yu6_z_review.pdfIn PDF document text
    • https://cdn.sqhk.co/tefupudoma/EsijMid/xofivewokazawixodemomiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480187/normal_6023f6f913a61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486206/normal_5feb30210243c.pdfIn PDF document text
    • https://cdn.sqhk.co/kosibowo/jjmhbYP/snowflake_stock_price_prediction_2021.pdfIn PDF document text
    • http://dutuvowori.22web.org/flyer_template_powerpoint_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/jamhbjj/huey_p_newton_chair_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/ghaiaUo/sonny_acres_ticket_prices.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_5fd85186c552b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wubijati.epizy.com/how_is_ablation_for_pvcs_performed.pdfIn PDF document text
    • http://bimegisekew.epizy.com/adobe_after_effects_cc_2018_intro_templates.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_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 5360 bytes
SHA-256: 6f5bf8243eab9169bca61cf874e262ddb2af45664aafe8598d0fbcbee055a564
font_01_sfnt_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 12432 bytes
SHA-256: 91f80ad854959535fa01850f6174038ea3c584255405eb03664ee19d5e7749b8

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