Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7d950e1005f045…

MALICIOUS

PDF

89.2 KB Created: 2021-04-02 00:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 91adb723b75e12a1035dff48fa9de584 SHA-1: 03601ace60a73602bf80e40e39fc9f5c3ca30b5b SHA-256: bc7d950e1005f045f6ddbb23334b08f1d8cf59a951ea03dc8cb209d9e40dedc8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs hosted on file-sharing services, indicative of a link farm or SEO spamming operation. ClamAV and ML heuristics classify this as a phishing or malicious PDF, likely intended to distribute further malware or engage in phishing. The embedded URLs suggest an attempt to redirect users to malicious content.

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
  • 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://golowaki.ru/award?keyword=flight+of+the+bumblebee+sheet+music+piano+pdf+download PDF link annotation
    • https://cdn.sqhk.co/tatidukigag/iiAyiiu/tiwuvibipowotiroruta.pdfIn PDF document text
    • https://cdn.sqhk.co/lowovegoxoji/40uihib/algorithms_robert_sedgewick_4th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/kulabokirow/h2Nlhga/varojepikej.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/ehcGQie/fiwerukakipokalojorizuted.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/ghifgfq/wuwurubosobiduwigo.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/iejje2J/infinity_symbol_text_copy.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/IojePWV/bejeweled_classic_para_pc.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/tirimofufemukat/cuanto_equivale_150_gramos_de_harina_en_tazas.pdfIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_3d38c970430f401c9ea16b86163bf553.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/lituduvidofaneji.pdfIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_f3541b7777a1424a925810d14b2632a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/51536120270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/523dab84-d604-4754-9f79-18d1aabfa807/go_ask_alice_store_santa_cruz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6ca8205-755c-4179-8733-c32acab092c8/apple_airport_express_top_speed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd966d06-45b0-4f51-b0e8-f77756585ca2/what_is_business_according_to_different_authors.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/17177049874.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/tartini_devil_s_trill_sonata_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/biography_template.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 5540 bytes
SHA-256: 512387610bd32c9a6da4ce7da4c81068bffea9bf37d256e53fc0d049eed6b674
font_01_sfnt_off00010d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D65 11312 bytes
SHA-256: b6b2c2e453199de0de51360fd11ab6be4835ada713b38c2c786284d08fc87db4
font_02_sfnt_off000133b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B8 16100 bytes
SHA-256: 84650fe671c70ac66f3af0994468c9b9feb42d01905b0f030d5781e095ef8e52
font_03_sfnt_off00014887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14887 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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