Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ef1cca37b5650c…

MALICIOUS

PDF

73.5 KB Created: 2020-12-23 07:01:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 77af2c51972c01da103365836dc00db0 SHA-1: 323658170f94c3997234ebc1bfab8d26812d0262 SHA-256: a1ef1cca37b5650cf8b241f6fcf3f26920ae323a77efbaa786d1145fcfb2dbe7
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute content across multiple sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=first+aid+supplies+wholesale+singapore In PDF document text
    • https://zexotanus.weebly.com/uploads/1/3/0/8/130873712/4459887111.pdfIn PDF document text
    • https://sumulepali.weebly.com/uploads/1/3/4/8/134882140/fozijelekel.pdfIn PDF document text
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/wolalu_vutut_jokimar_pujubi.pdfIn PDF document text
    • https://wovuxekas.weebly.com/uploads/1/3/4/3/134379471/zolazolunaza_bijiwetu_zawabaw.pdfIn PDF document text
    • https://jezitazosebizag.weebly.com/uploads/1/3/4/7/134700096/2796375.pdfIn PDF document text
    • https://bososafevibusup.weebly.com/uploads/1/3/4/0/134041518/5929727.pdfIn PDF document text
    • https://derodaju.weebly.com/uploads/1/3/1/6/131606282/dc3c21c6a.pdfIn PDF document text
    • https://mitegasur.weebly.com/uploads/1/3/1/8/131871816/7495549.pdfIn PDF document text
    • https://sikewebuki.weebly.com/uploads/1/3/4/3/134387003/fd7f3bf616098f3.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://static1.squarespace.com/static/5fc6de87579eee3ae06a2129/t/5fc78ecb5060c93fcd8183a6/1606913740527/best_american_football_prediction_site_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07e3381d-57db-4f88-a905-edfd59f9c753/20413504373.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1c049c6d9645836281f45/t/5fc3669a08845d0924f519b0/1606641307065/autodesk_sketchbook_pro_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51087c6229360ecc7aa43/t/5fc63403145a8629dc84d047/1606824964484/red_balloon_toy_store_coupon.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc11362403f5353fd96c027/t/5fc80128c1b6f236570e592a/1606943017420/best_virtual_race_apps.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_off0000d3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FF 5152 bytes
SHA-256: 97c4a630f05a76e27b5b760d59f985f14307c8298500ebb8bff0c264748fdc58
font_01_sfnt_off0000e589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 10888 bytes
SHA-256: 1784ca35f998f22b46fa7f080a79fa8c9f980b3b3c2944d4cc2be944dca99ebd
font_02_sfnt_off00010aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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