Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8906768f5c5f2c…

MALICIOUS

PDF

74.0 KB Created: 2021-01-26 10:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fa3a641d9161af0de1700590926b1d9c SHA-1: 42b79bf2068e2cf5a2ba9d2d9e0172002a7dcd71 SHA-256: ff8906768f5c5f2c9d9af9eb035206cde5bd9dbd643a6162737cee2689f219ac
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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/aws?utm_term=3ds+max+dope+sheet+copy+keys'. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0'. The ML classifier strongly flagged this PDF as malicious. The embedded content, though heavily obfuscated, does not provide further specific indicators of intent beyond the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=3ds+max+dope+sheet+copy+keys In PDF document text
    • https://static.s123-cdn-static.com/uploads/4465274/normal_5fcf510a2ff3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455179/normal_5ff2293120e89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420034/normal_5fc5a8bbab790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413373/normal_5fe7ea1689869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443344/normal_5fd0e245924b6.pdfIn PDF document text
    • http://tdsevsvet.ru/144266523546tbse.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481273/normal_5fc7d87253afa.pdfIn PDF document text
    • http://gonzo-3d.com/79977702778kihdm.pdfIn PDF document text
    • http://skidki-day.store/xinezeweregajisowirejibuxuak1u.pdfIn PDF document text
    • http://kernig.online/best_car_simulator_pc_2020t46yu.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/jeworurowam/83561875518.pdfIn PDF document text
    • http://malinaliwul.epizy.com/27421285759.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/48131506553.pdfIn PDF document text
    • http://pugatexekar.rf.gd/administrator_command_prompt.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/76198269182.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/bessemer_converter.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/12805566349.pdfIn PDF document text
    • http://desibevazivoxan.rf.gd/multiplying_fractions_worksheets_with_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/bauder_single_ply_installation_manual.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_off0000e638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE638 5488 bytes
SHA-256: 7bc607e0865ec03653141b2dc233500323ac80c55b62cd717ceada4fb2d73e12
font_01_sfnt_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 10060 bytes
SHA-256: 7a2cb9f0c99ac4576f1ffac4bfdabd2940795ddfda82df3536ae070a1348c589

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