Malicious PDF — malware analysis report

Static analysis result for SHA-256 7413a22518de3347…

MALICIOUS

PDF

60.7 KB Created: 2020-12-17 10:31:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 53f6b747492e310b863be3afc4476bdd SHA-1: 459b05246bc02a6a4c8f855006314c930f1a8db1 SHA-256: 7413a22518de334704479a3f141d6577e4cfe48faf7c0b18f6562d601f0fb0b2
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The embedded links, presented as academic study guide answers, likely serve to direct users to phishing or malware distribution sites. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=hamlet+act+2+scene+2+study+guide+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4502920/normal_5fae4a2983187.pdfIn PDF document text
    • https://tosofeguwus.weebly.com/uploads/1/3/4/3/134321705/juzada-wixenusosugi.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/297e9112-c563-4b77-a640-0bc802f861f1/bibetofiwikidopavo.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/expo_action_sheet_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f99f774e-a69a-401b-a18d-1ab24b86d087/fogenidafolilokonoxusen.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/panasonic_nn-sd681s_microwave_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/049b500b-262a-4a19-87c6-d02dea61e355/53652272946.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/blackberry_z3_firmware_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00c6f0c2-d5a0-4e51-8e1e-8d2b335732d5/91208456322.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/bengali_movie_hd_video_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/pabenojamuwitis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc846ba-e456-4d97-b710-d3e514180c9a/77993593371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd70e7be-2cc9-4069-a4d5-63839ef1406b/the_summons_hymn_sheet_music.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_off0000b256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB256 5544 bytes
SHA-256: 7cd49df40f1cc772eebe3cc40acd201a73a9fdf2cb5ee97ccdc7ba51d6548e29
font_01_sfnt_off0000c534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC534 9732 bytes
SHA-256: c8c223d74d3c4dc07a8bc5a5923ff1820d9d53bdb4bc54ecf8e40cb336904a69

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