Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe97afef037c84a…

MALICIOUS

PDF

81.1 KB Created: 2021-05-26 16:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6d38cfd9237583219dedefa5e89bf11f SHA-1: 9bf641c8964576ae59c61e7bbb75f8b40b0e2ac3 SHA-256: 8fe97afef037c84ac120ebc3a4fbd3bd49ee2636b8348570ef057a3c58900fe2
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://maypoin.ru/strik?utm_term=online+onion+root+tip+mitosis+lab+answer+key PDF link annotation
    • https://nabofirolem.weebly.com/uploads/1/3/4/6/134632364/8834155.pdfIn PDF document text
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/8748820.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481509/normal_5fee298fcfe2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369771/normal_5fcfb5b731607.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408858/normal_5ff2aad56e7d1.pdfIn PDF document text
    • https://posajegodat.weebly.com/uploads/1/3/4/4/134477503/fa63c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_601395901cf81.pdfIn PDF document text
    • https://nokemodikobo.weebly.com/uploads/1/3/4/3/134308311/15bd25.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/bf4aca52-69b6-4526-aed6-1e5dd42f952a/paintball_jungle_waiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f1483ee-f80b-4902-9eef-b9ed4b016dd7/como_ganar_amigos_e_influir_sobre_las_personas_mercado_libre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57166047-fb47-4e74-b875-81d57e9ae95a/how_much_does_it_cost_to_get_your_female_dog_neutered.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/581498ae-319b-4bae-b18d-5931e5a595ca/do_books_have_an_age_rating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20d1e639-a0a6-4550-a574-1a561ed5bf96/zeziroxerisikesizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cccc2022-0a89-4445-915c-242c04a29b05/how_much_does_it_cost_to_lease_a_honda_civic_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a1dbb6-760e-4311-bc1f-319585602ee1/wegix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de0cc0f9-ea3a-4aa3-8079-6267ac9e0a20/49012325925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b331ec-3c74-4661-86d0-da6d04bc5793/monkey_wrench_gang_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/231461ef-424c-4ef0-a0d7-2aafc44bcac1/dajixanubolerewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb2cdd1-29d5-4b30-8084-d947b7bb47b6/how_to_grill_whole_fish_on_weber.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_off0000efbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 5180 bytes
SHA-256: 04e80f2e1baa81dcd03ddf615e5a78d9b3ff35ed12290ffb1c033ae794944e59
font_01_sfnt_off0001014b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 11048 bytes
SHA-256: 4d5db51922a74c7bc17ddb56b8d149e49907d94f4d0bf61346036ad164028814
font_02_sfnt_off0001269f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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