Malicious PDF — malware analysis report

Static analysis result for SHA-256 d440cd4105b10d12…

MALICIOUS

PDF

66.3 KB Created: 2021-01-09 04:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 068c8b8d42c8b9bf9c1f9d555e40aac1 SHA-1: 282a54822d3d0ef36b234ee6a8af62038fff2afa SHA-256: d440cd4105b10d127c7cf6f91f6abe0fb4687eaa4f058d13e979ab32afd7d40d
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm and an embedded URI pointing to 'traffset.ru', suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/wb?keyword=mindshare%20medical%20careers PDF link annotation
    • https://jixepelisu.weebly.com/uploads/1/3/2/6/132695865/dedanolimivobejidane.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426415/normal_5fe0b3f4e9352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380701/normal_5fb7a97900a84.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/d947a81f-0628-4bde-b5cc-2b2fc7ba9f06/en_el_estudio_de_las_ciencias_sociales.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/33944287475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9246434b-f7b7-4b8f-84d1-d0b9fa797f27/82757617309.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/assassin_s_creed_2_pc_compressed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3cd56ef-cc03-4a85-b4a4-b710aceaa0df/inflation_rpg_maze_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c17ca25c-3a96-428d-aa67-bfb39800639e/sidub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed82eed5-399a-46d5-8cef-c87d22647d9a/42531995168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9645fbe1-d7b7-4380-886c-68e4439e2909/trigonometry_special_right_triangles_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1fae4eb-405a-453f-a20e-b8875ea77513/29240093548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45c5cfb8-1d1a-4fe2-9ec5-b0d89bcd4a32/hack_apk_for_clash_royale.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_off0000c7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B7 5184 bytes
SHA-256: c351a82e9765c00385e4e150768e0bbe46cfcb7f55489385a48c4be52dee6fb9
font_01_sfnt_off0000d936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD936 10504 bytes
SHA-256: 8b8f62c113ab8fd0987cb7a95905e086fe1834c4d67c119de8370d8b1feb102f

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