Malicious PDF — malware analysis report

Static analysis result for SHA-256 f562e78a76cf0e3c…

MALICIOUS

PDF

154.2 KB Created: 2020-12-31 18:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1d6a83e63f029c67965e62c9ce668d66 SHA-1: 19e031c2c9b2a102241672c09ac4f60bf2e827cc SHA-256: f562e78a76cf0e3c59000c0bc912df4b354d3f03604d3a28649841cce8d98c84
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though corrupted, suggests a lure related to educational materials to entice users to click the malicious links. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/123?utm_term=math+module+grade+7+teacher%2527s+guide+answer+key In PDF document text
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/pesupabikan.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/ziban.pdfIn PDF document text
    • https://fadatofi.weebly.com/uploads/1/3/1/3/131381363/9119745.pdfIn PDF document text
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/newajumeje_bewotuzirabive_duwejupuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_5fabf2c71f1ca.pdfIn PDF document text
    • https://motovonesavot.weebly.com/uploads/1/3/4/6/134690882/874178d42cce2d3.pdfIn PDF document text
    • https://badexakabenal.weebly.com/uploads/1/3/4/0/134017850/jakediw.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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://uploads.strikinglycdn.com/files/f3554785-aa3d-489f-a49c-53b4703df8aa/music_equalizer_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc97d3fb-84c6-49ad-ac42-7d918cbe028f/silepukoratifetatoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f8bb13-f49e-46ed-9831-8c1679a634d1/social_inhibition_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81705f87-e0d5-46fe-92a7-c5b0832c8acf/wunezolujofelu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1FB 1872 bytes
SHA-256: cf373f8eb364677dc8d29ae0cbe658a1b8665e9067f0cd69b3a2e84d4b370a53
font_01_sfnt_off0001faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FAEF 5612 bytes
SHA-256: 1034581bf0b0c1f99262abb8f8afc788400b5185a6036b7185ce517b639d6e23
font_02_sfnt_off00020e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E07 11940 bytes
SHA-256: badd500b835e61ade431f8583b009a0bdda8a6b79db95e6569480586beec956b
font_03_sfnt_off00023727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23727 16112 bytes
SHA-256: 366b2a3ed9b44e620159a8175e6f9935b0189d17b94b4d5ccfd5980b0b155f3e
font_04_sfnt_off00024c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24C05 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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