Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c1278bccb53df9…

MALICIOUS

PDF

89.0 KB Created: 2021-02-10 17:20:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e010874fa95e13fb70c1997f3f8bd17c SHA-1: 664f55cb9a2a5178f44e86995506687629452de7 SHA-256: 83c1278bccb53df9a52d16ea80862864aeda40953c684a8d2dd6afcf85e31288
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wb?keyword=atypical%20pneumonia%20pdf%202017'. This indicates the document is designed to lead the user to malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious URLs and the redirector link strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=atypical%20pneumonia%20pdf%202017 In PDF document text
    • http://wunowixumofe.22web.org/zajunana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446162/normal_6010f64c50885.pdfIn PDF document text
    • http://sudiwemubitep.22web.org/63862803516.pdfIn PDF document text
    • http://bamizavol.22web.org/bulgarian_phonetic_keyboard_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415292/normal_5fca2d56e2405.pdfIn PDF document text
    • http://pitowiragomiwa.22web.org/curses_n_chaos_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414687/normal_5ffe471682103.pdfIn PDF document text
    • http://dusefibesix.iblogger.org/medicine_dictionary_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469350/normal_5ffd11feaef21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366024/normal_5ff01c1644aae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450440/normal_5fcbfaeded933.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/fifuto/apple_spice_sheet_cake_smitten_kitchen.pdfIn PDF document text
    • http://butejoki.rf.gd/75567213758.pdfIn PDF document text
    • http://magajavopisili.epizy.com/kuwopek.pdfIn PDF document text
    • http://velumosak.epizy.com/registration_form_sample_template.pdfIn PDF document text
    • http://liwukoxobumex.rf.gd/13425234599.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_off00011db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB5 5524 bytes
SHA-256: b1b642d1561dc8aae4f34fbb31e73a9afb530729621bf6cd44dd29cab34e7dc1
font_01_sfnt_off00013090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13090 11680 bytes
SHA-256: 5427e4a710468b146543e8913ce499b05f4d29ba6bcaf502a5f6d8ac3ace0e21

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