Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b5a0ffcb37ef04…

MALICIOUS

PDF

75.3 KB Created: 2021-03-27 11:18:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f883da3c3fd9f2101318e30e2f632ca0 SHA-1: 133937a8ed4f96069da8c14b513152129cb494b4 SHA-256: e8b5a0ffcb37ef04b62f345f38518484e802cf62644a93bd6d172e716f1eb9f7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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.
  • 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://jumiwimov.ru/award?keyword=astm+a182+15+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465555/normal_600ca8377aa5b.pdfIn PDF document text
    • https://cdn.sqhk.co/gobumavurob/hcEjjsL/marktplaats_account_aanmaken_particulier.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/7hdjhne/download_real_car_parking_multiplayer_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/refimadaraze/bbijhaZ/11790464624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379846/normal_600bf8433ae92.pdfIn PDF document text
    • https://cdn.sqhk.co/lulaxujik/gjdS0FI/dropped_ice_cream_cone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450864/normal_601700b1bb08c.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://05efeaee-ea5b-4dc8-bddc-a5098cc0dcbd.filesusr.com/ugd/c06c30_58d2669513214f52964e7c1bea40c8ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ff7ad7-5d62-473e-b14c-66541d2fb003/what_does_a_senior_manufacturing_engineer_do.pdfIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_08ba01c684244b63a70db65a54e801c2.pdf?index=trueIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_f5ed036a2a2b4395ac039c7b515d72f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b72888f-3bbe-4fd6-8168-6f851ea3c380/84169336345.pdfIn PDF document text
    • https://b7c0b8aa-2746-4b81-86ab-4dfcec723e12.filesusr.com/ugd/383078_31a2f34d31bb49f2a8641dddeb2873f2.pdf?index=trueIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_0eddaaa7d4274a4d8f2c79c810a00331.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44addfd2-aed3-410c-af44-2ca93f3ece4d/how_to_do_a_hard_reset_on_kindle_fire_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/405f40c0-9e3c-4ac6-b482-528b46d59e88/vufulevibufitunike.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_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 4956 bytes
SHA-256: 87344f9fcd62f5c84b7a0d63ba8b897a8084c20578ef9b07aa376b3893d0512f
font_01_sfnt_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 10672 bytes
SHA-256: 21d37fa8355050ec915b40996676a232e79afb8f0dffa649c185bd5302422ac9
font_02_sfnt_off0001128d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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