Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42c6e12e05ac00e…

MALICIOUS

PDF

74.8 KB Created: 2021-03-01 13:08:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 672abe3b29b8a2dfa70b2980f09f5935 SHA-1: b8800dbb0c616b4aa1311fa71db3fd847bac1cb7 SHA-256: c42c6e12e05ac00e4b555aa3a70af84a031b81f94ff45295c1cc7bf5213a4d81
156 Risk Score

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 0.9997

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://dafemum.ru/123?utm_term=rebel+belle+summary PDF link annotation
    • https://sunajekivogemaz.weebly.com/uploads/1/3/4/8/134895881/609c1266ec4405.pdfIn PDF document text
    • https://witixufiro.weebly.com/uploads/1/3/4/3/134388363/5546866.pdfIn PDF document text
    • https://feroxetisilujux.weebly.com/uploads/1/3/1/4/131409167/5871645.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/b0wgHI4/sweet_candy_fever_game_free_download.pdfIn PDF document text
    • http://tigexesuni.22web.org/english_to_arabic_offline_translator_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/aOidk41/wiring_diagram_for_crossover_ethernet_cable.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://s3.amazonaws.com/wuvepilamamuse/steven_skiena_the_algorithm_design_manual.pdfIn PDF document text
    • http://gigapenawer.rf.gd/lufujitilutubula.pdfIn PDF document text
    • http://lorenivi.rf.gd/beatles_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/76548790826.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/fenapod.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/how_to_use_copper_grill_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/89881342037.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_off0000db3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3C 4620 bytes
SHA-256: 7d5a3c2da9f9920c6a16ebeadd7be99a7710f0ede66c7655ef04c340074569f2
font_01_sfnt_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 10880 bytes
SHA-256: dd0e45c9fdc3bb7166e946e2a061d11d1e45a669d8a7b64698b3987888286cb1
font_02_sfnt_off00011032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11032 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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