Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e662156b00982a…

MALICIOUS

PDF

68.2 KB Created: 2020-11-26 06:02:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 677a339d531a0913c0a1c244aa2d843e SHA-1: de8c0df520da545452dd3e151c031d2d2bec7294 SHA-256: 39e662156b00982aba798238d5487f96dd0129be7c1142c5853d03a2fba10d7a
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves redirecting users to external sites, likely for phishing or malware delivery, leveraging a link farm to obscure the final destination.

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://traffking.ru/strik?utm_term=cell+transport+mechanisms+and+permeability+computer+simulation In PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/2431008.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/719650c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421787/normal_5f9c0d9d7774f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425491/normal_5fb5cdf6417c9.pdfIn PDF document text
    • https://gujojiri.weebly.com/uploads/1/3/4/4/134434224/fajazir.pdfIn PDF document text
    • https://voxepobar.weebly.com/uploads/1/3/4/6/134668427/21506.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://uploads.strikinglycdn.com/files/aef79ab9-6944-4fe9-9e98-b4b17eb64191/xizisozugevixusavotagez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bedd2359-039e-466a-a293-005767006414/72156911463.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/9769606694.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/balipefadomusanoxajatub.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/vidmate_video_er_apk_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df532854-ef78-45ec-af61-5538bcbb26fe/the_walking_dead_episodes_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6037a661-d0ba-475a-b4d7-0e079923a271/last_day_on_earth_free_coins.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_off0000c013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC013 5460 bytes
SHA-256: 73eaea2a006459b4eb84306e546fd845bee4272ed0d76d35d7bade4ee2190e20
font_01_sfnt_off0000d267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD267 10236 bytes
SHA-256: be90b1de129dabc21c06934869ba6c45b5ddf59c019f56a3d866fc0d7b937d48
font_02_sfnt_off0000f55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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