Malicious PDF — malware analysis report

Static analysis result for SHA-256 66dec5e790bcd82f…

MALICIOUS

PDF

79.1 KB Created: 2021-05-07 04:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: cf1824bce9730f0887f8d39029aff016 SHA-1: ee72d6bb91ef5546de2319df151596a85b49bf16 SHA-256: 66dec5e790bcd82f5cded9dfe913c006e4a573ec7b747f12ff1ef3fa21549940
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating it is part of a link farm, with a primary external URI pointing to a suspicious URL. This URL is likely used to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xajibur.ru/strik?utm_term=black+and+decker+3+in+1+waffle+maker+walmart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493200/normal_60462c15d570e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405907/normal_6007748a6e7e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476294/normal_5ff8afe17e177.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416149/normal_5ffc4ea3cafcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450507/normal_602e3d311ce7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389387/normal_605ef258df2a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462093/normal_605f7ed04cdee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490547/normal_606e4837e6598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422908/normal_5fd7885543a2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482002/normal_5fd0f40241010.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/8a7bc65b-ba52-40a5-b0c2-761a81a124d8/can_you_use_car_jumper_cables_on_a_motorcycle.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/maxi_dresses_formal_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/dojefezoruviw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/028f1b90-b7a6-489b-b4cc-7829ce8e8171/61840044985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c71b8cbc-54d5-4b00-a40d-cc7421d564b5/59237767742.pdfIn PDF document text
    • https://34fef40c-4934-4c56-b24d-59915ed92566.filesusr.com/ugd/806295_532bba5db38b40cfa6a8b16a9de31f25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d65907d9-3355-4e50-820b-314059fd8940/gejunuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36d7152a-154b-47b5-a5ac-7eaf9bbf6529/25232383568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92dca0cb-e653-4bc1-9ee7-c1740b633888/rumokupana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9651eab-28d6-44c2-ba99-c6b4cedeeb55/rupuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/707573bb-0a89-4d61-af79-35f75df7c74f/kingdom_manga_640_release_date.pdfIn PDF document text
    • https://3c3bf0af-c02c-43ee-ab56-a2e3f1f4987d.filesusr.com/ugd/97f7bb_8ed5c25aa941475f9bbd2b5dac8c7a2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ee9753e-e3f6-4ec2-bdc6-8bf2dceeec9e/hydroranger_200_hmi_manual.pdfIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_b39b77e28e6a49ee8d345c5ce88fb8e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1918036e-2a55-4848-89ca-57813b1e7db7/what_to_write_in_your_godsons_first_birthday_card.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_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 5408 bytes
SHA-256: 77eaedc4a23da1674e1e2f8448028a504a4ebb9a75a6156150c4053b18ca916b
font_01_sfnt_off000108b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 10980 bytes
SHA-256: a59e226782a469c2d27f6f68e7f9cbec091183e17fecd18a5d8df980a3e60af9