Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2aa70edf18fd979…

MALICIOUS

PDF

79.9 KB Created: 2021-03-20 13:37:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86541482ce5b9b9393591604f027f1ff SHA-1: b0dcb1b9b8c46a9ec8aa9e07b1bba761bb6daa13 SHA-256: a2aa70edf18fd97999b01a44fcf953c86e2c93bcda3f9b49f506ad2043908b03
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary URL observed is https://dafemum.ru/wix?keyword=the+outsiders+book+study+guide+answers, which is likely used to redirect users to malicious content. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=the+outsiders+book+study+guide+answers
    • https://bapamebitisetup.weebly.com/uploads/1/3/4/3/134325238/besegisujevepadutido.pdf
    • https://musonilemif.weebly.com/uploads/1/3/4/7/134752032/jerep_gawulupojuwonif.pdf
    • https://zeposonuvijuz.weebly.com/uploads/1/3/4/7/134702940/3cf73.pdf
    • http://mamafiposorugul.sportsontheweb.net/51077276341.pdf
    • https://cdn.sqhk.co/nobutowug/hbgijPZ/25745899407.pdf
    • http://lipexifinidoda.scienceontheweb.net/32686007882.pdf
    • https://cdn.sqhk.co/gikiwifada/hcfiajg/zubevajevewotu.pdf
    • https://cdn.sqhk.co/towevefizub/jfqgeAS/time_mysteries_inheritance_walkthrough.pdf
    • https://xuxufidumexed.weebly.com/uploads/1/3/2/6/132681394/kiwutuwaz.pdf
    • http://sazulido.medianewsonline.com/cariotipo_xyy.pdf
    • https://cdn.sqhk.co/vemonososepa/gzhe4ic/moon_patrol_video_game_music.pdf
    • https://cdn.sqhk.co/jewimebobi/gfMhchh/xumuvatomido.pdf
    • http://kepuxom.mypressonline.com/burda_style_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fatavetotujel.onlinewebshop.net/free_aptitude_test_with_answers.pdf
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_1602b4e356b34b9eb6d9a67a9f1ff84f.pdf?index=true
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_b5c052c024fd456f9764d23cde7c7d71.pdf?index=true
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_9a9cfcdaa0bb42858e150d0fa53b30ac.pdf?index=true
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_9898e7d6c1b44dc0bd9d10c5cfa5fb2f.pdf?index=true
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_cbe8a63af2e84e54981c51b61fe3e0e8.pdf?index=true
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_5bce6bee7377495480c098027b2c4c02.pdf?index=true
    • https://34fef40c-4934-4c56-b24d-59915ed92566.filesusr.com/ugd/806295_408d06f7957c448ca0436987eb45142b.pdf?index=true
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_d77ff8441e2849c78e0508d22a434815.pdf?index=true
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_002fd7d5168a4cddbd9602671ca7f48b.pdf?index=true
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_6e5594d7a98a4ad8aa3f2b02dac8e09c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb87.bin
1eb6fb2ef9433d4ea7d5caf49fcb5ec8b2927ff5834e7087e05319891fa1b9eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 5284 bytes
font_01_sfnt_off0000fd8c.bin
cd9166b0330fdde8ed7e7902877ffc144fa5be53ec102c12c46f2f374c5004d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8C 11204 bytes
font_02_sfnt_off000123b9.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123B9 4324 bytes

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