Malicious PDF — malware analysis report

Static analysis result for SHA-256 3799ac6b74800b16…

MALICIOUS

PDF

72.4 KB Created: 2021-03-08 05:16:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d506d1fb7836ff438cef35b12edb408 SHA-1: 1e75ab7d2f5f5bd6c6ab8683af6cfdf30e388c7a SHA-256: 3799ac6b74800b169d7dcf63d528fff5fe05ebf607d98b853c0411108ea3d91a
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://resalured.ru/strik?utm_term=dcs+p+51+startup+procedure', is flagged as a potential malicious destination. The ML classifier and ClamAV also strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were directly extracted, the structure suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=dcs+p+51+startup+procedure
    • http://jadebey-x.com/how_to_clean_a_m11_ultraclavehg2al.pdf
    • https://deduxujixonegox.weebly.com/uploads/1/3/4/7/134731806/fejuv.pdf
    • http://lotibamuzuti.scienceontheweb.net/56560443987.pdf
    • http://lubenoredeji.mypressonline.com/40836080664.pdf
    • https://fumitalabojaluk.weebly.com/uploads/1/3/5/3/135399187/1351130.pdf
    • http://espaceabonne.com/duderakemwts6q.pdf
    • http://mamafiposorugul.sportsontheweb.net/pride_and_prejudice_chatsworth_house_filming_locations.pdf
    • http://kunujunekedi.mygamesonline.org/vtech_cs6919-15_cordless_phone.pdf
    • http://ziwewixowele.sportsontheweb.net/52100664973.pdf
    • http://dojemop.mywebcommunity.org/80035560965.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/0a148859-bda3-4caa-8bf8-614b7f292c8c/82284183945.pdf
    • https://uploads.strikinglycdn.com/files/486ca6b0-c32a-4c00-b664-e92e4ded855b/66264945323.pdf
    • https://uploads.strikinglycdn.com/files/e82148bc-9f4d-481c-b6c0-9de48dfa1a1a/the_giver_final_test_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/19d5353a-026e-4c6a-985b-4904969551d4/fomevuwuvezitojetek.pdf
    • https://uploads.strikinglycdn.com/files/3460523d-7793-4f1b-8364-67e3ea3e1a5a/bozamowedudejexowo.pdf
    • http://fidalanono.myartsonline.com/how_to_self_arrest_on_a_snowboard.pdf
    • http://lukafimagog.atwebpages.com/it_book_chapter_3_summary.pdf
    • https://uploads.strikinglycdn.com/files/0fcee79a-5e0d-41b4-8ccc-28246bb980b9/54136829070.pdf
    • https://uploads.strikinglycdn.com/files/19073536-86d1-4f99-b37a-054d4adee7e5/dungeons__dragons_spellbook_cards_volos_guide_to_monsters.pdf
    • https://uploads.strikinglycdn.com/files/ddad38e5-a732-4227-8073-8db95fe0b70d/10449930503.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0e8.bin
1c084c8e06304490e6e54dc2fa0d92770d8b6999b8d47f4ac87eb6dd4fe5ce67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E8 4936 bytes
font_01_sfnt_off0000e1cb.bin
ae03523088bf44bb4832ea51475f903d7ee9ae641cf053028708c79621ec1f40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CB 10740 bytes
font_02_sfnt_off0001069c.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1069C 4324 bytes

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