Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c60c71279f2657a…

MALICIOUS

PDF

138.9 KB Created: 2021-02-16 11:05:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: db7da34265f5a2a4ae816d9adc808ce0 SHA-1: 0e0057b741cc6762bf406de3ce7eabbc231c78d9 SHA-256: 1c60c71279f2657ac08bb8824ecefaf5e8284866358c1c832d375aea01e1a3ed
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical alert for a PDF redirector link to 'yafferge.ru'. The ML classifier also strongly flagged this PDF. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the redirector heuristic suggest an attempt to lure the user to a malicious site, likely for phishing or to download further malware. The document body appears to be corrupted or obfuscated, preventing a more detailed analysis of its content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://yafferge.ru/123?utm_term=tc+electronic+hall+of+fame+2+reverb+manual In PDF document text
    • https://jetovalanowu.weebly.com/uploads/1/3/0/7/130739462/5104680.pdfIn PDF document text
    • http://satomupudogoni.22web.org/89440184364.pdfIn PDF document text
    • https://bivixogerixud.weebly.com/uploads/1/3/4/4/134469213/pozuzajuniwejul_potulodixuwufi_likovarugotef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427811/normal_601f1dcaba608.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383471/normal_5ffd6edc6ddaf.pdfIn PDF document text
    • https://bejuzozomixur.weebly.com/uploads/1/3/5/9/135966319/wiworokodumedok_takosejazuv_vokapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465397/normal_5fe786beee854.pdfIn PDF document text
    • https://senorori.weebly.com/uploads/1/3/4/6/134641151/sokexal_kobukalavukabi_pejebawenubuz.pdfIn PDF document text
    • http://goproits.com/fsc_fpic_guidelinesg6j2x.pdfIn PDF document text
    • http://rejilif.iblogger.org/69222182256.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/nagotugopajiwofobaf.pdfIn PDF document text
    • http://keputeka.epizy.com/chow_kit_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/fonituxid.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/gasetiw.pdfIn PDF document text
    • http://vunowilivazadul.rf.gd/art_software_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/bajirao_mastani_full_movie_1080p_worldfree4u.pdfIn PDF document text
    • http://nenadizalotoj.epizy.com/15020490629.pdfIn PDF document text
    • http://liwumulexajuvi.epizy.com/42608094665.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_off0001e631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E631 5224 bytes
SHA-256: 7b7a5751d6d001c03567941f5fb8f7307d3ef6685d223d647169d6ed921cd94a
font_01_sfnt_off0001f7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7D8 11200 bytes
SHA-256: e9f421e90f9877b3d31990e167d87f14c7872f429025f5a534d804de68764555

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