Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c72763979f6bc7c…

MALICIOUS

PDF

63.8 KB Created: 2020-12-18 06:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: fe3ee3aad00c617eb5901aad47d4f406 SHA-1: 66ccccdccef44173c5fdc7b19923316b9933c172 SHA-256: 1c72763979f6bc7c3a9186b91df1f425565c8aee3cac015cf9e4b2743f7ebaae
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that points to a suspicious URL, disguised as a book download. This is further supported by a critical heuristic firing for a malicious redirector link and a high ML score. The embedded URL is likely intended to lead the user to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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=segundo+libro+de+enoc+pdf+descarga In PDF document text
    • https://cdn-cms.f-static.net/uploads/4460477/normal_5fd982bd6d7df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403557/normal_5fdbe01a2c0f1.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/ced916ed-b8e3-41f8-9c38-1983a251eb16/2006_bmw_325i_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5825b08b-4f70-4ace-8753-5d13eed8867c/7mm_mauser_ammo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1380dc6d9645836244656/t/5fc29d59bc819f1cf42dd76e/1606589786699/cars_fast_as_lightning_apkpure.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7904a778af068263f36d1/t/5fd18638fec2791e31ff59d1/1607566904890/warrior_adventures_super_run_arcade_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15262448-50e2-4f3e-81ae-52fc945d3535/95701952530.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2b03bbd14ff0dd2a824dd/t/5fc5199b3485235c8668339c/1606752669083/soot_bull_jeep_bbq_house.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ebbe6c9-2892-4e5f-907c-38e2a7ae6ce9/redukesutipepogepuxos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae9502b-0eec-431f-bbbf-8edb559903ed/wegowojodonigozisajeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3355d4f3-af33-407f-abb0-9a07fcb52dad/miregadiwa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7aad65fa98a681f0fdb69/t/5fd05687cb6bfe602c4dcf95/1607489160064/31821040737.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5303b8ef7301f8b2cf6bd/t/5fd124828c49b64c3bc54e55/1607541891746/nagaxibalozaxodogop.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc526fd92c50b1a1e9314cf/t/5fcfc04197ef4e4d1daf6b95/1607450690002/84858126772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/816290c9-06db-433a-9f51-4732e561616f/god_helps_those_who_help_themselves_verse_in_bible.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_off0000ba9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9B 5568 bytes
SHA-256: 3c937143d23c769120a0abf0a23384442f5b2d71e09ddc960bf927679d88a797
font_01_sfnt_off0000cd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD99 10868 bytes
SHA-256: 3be3d0cb524044cc2c7643a704d049bcefb4b7a34a5a6dfd36f9724848a3bd41

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