Malicious PDF — malware analysis report

Static analysis result for SHA-256 70bd719da4152f66…

MALICIOUS

PDF

69.2 KB Created: 2021-05-29 06:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 891598dfc9eae050fb4dcbf73e52b5e7 SHA-1: 5a96f0c61bb32756ff5cf59b4dc30d1acfbb2df9 SHA-256: 70bd719da4152f66693b3845d1292c63fee63ef15a95b199748cd579d7c92ddc
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://gimoguvi.ru/strik?utm_term=libro+de+formaci%25C3%25B3n+c%25C3%25ADvica+y+%25C3%25A9tica+2020+tercer+grado PDF link annotation
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/xotezizi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479470/normal_602b5e0465a9d.pdfIn PDF document text
    • https://ramitafot.weebly.com/uploads/1/3/4/3/134340854/katojadem-mobasukibaxur.pdfIn PDF document text
    • https://tovalowu.weebly.com/uploads/1/3/4/3/134375552/71660660e91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404529/normal_5fe3dd8fcc730.pdfIn PDF document text
    • https://migerele.weebly.com/uploads/1/3/1/4/131453560/nevajux.pdfIn PDF document text
    • https://febujularezot.weebly.com/uploads/1/3/0/8/130813651/wefilugudef_safanelugudifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_606c66177c826.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420028/normal_60049b913757e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374954/normal_5fc7f66966b54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418192/normal_6002de6fe3d95.pdfIn PDF document text
    • https://woxolifufoku.weebly.com/uploads/1/3/4/2/134234665/3619778.pdfIn PDF document text
    • https://tesetugunujogub.weebly.com/uploads/1/3/4/0/134040467/1e96b4883427a.pdfIn PDF document text
    • https://kemebawe.weebly.com/uploads/1/3/5/3/135313751/xejisofiwezalonugow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393763/normal_604b648439278.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7243f996-d6d0-4d74-ae9f-39a09f93b88f/lowrance_hds_7_gen2_touch_installation_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aadf17ac-4053-4bfb-aae5-89dd696369c9/78913966282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afe507b2-fa6a-472e-b3e1-61092f4652dc/the_way_of_the_superior_man_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/916c9ffb-0d0c-490e-b794-cc48ca8edae1/which_electromagnetic_radiation_is_used_for_satellite_communication__1_point.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e9a1240-0f90-4e07-89dc-3a849f39973f/how_to_donate_blood_with_antibodies.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_off0000cdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEB 5980 bytes
SHA-256: 0b17af1ddf7a332397702df65651beb8cc7dbf63d7c0affc14bb332e876bef46
font_01_sfnt_off0000e1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B6 10756 bytes
SHA-256: b5a6ca9def7709e77f4a2f8bacec5745ae8b926a8beb2fb063e8457e8d68d740