Malicious PDF — malware analysis report

Static analysis result for SHA-256 44571b42693c907d…

MALICIOUS

PDF

70.7 KB Created: 2021-02-19 06:54:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: caf76b5b830bd53af21e657b5e1e705f SHA-1: 2a9d37637b62f8d4810d251415764882b5a925e5 SHA-256: 44571b42693c907d43917a610c3d59c38c6a9aea79bd0c81d478842e13252427
154 Risk Score

Malware Insights

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

The file is a PDF containing a malicious redirector link to 'https://yafferge.ru/wix?keyword=i+want+candy+lyrics+original'. Heuristics indicate the PDF is malicious and links to known malicious infrastructure. ClamAV also detected it as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0'. The ML classifier output of 0.999745 further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=i+want+candy+lyrics+original In PDF document text
    • https://cdn.sqhk.co/fokodusi/gfcgjjd/pinball_pete_s_hours.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_5fd66e0f443bc.pdfIn PDF document text
    • http://nusamovepi.22web.org/free_storyline_games.pdfIn PDF document text
    • http://julaximufe.66ghz.com/bel_ami_maupassant_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407996/normal_5fd768d0e7364.pdfIn PDF document text
    • https://cdn.sqhk.co/nimabugokofa/jWGjehb/65939158198.pdfIn PDF document text
    • https://cdn.sqhk.co/rirerujel/cbDCget/discord_bots_groovy_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389107/normal_601f9ab057629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489852/normal_6011bb958e9df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497353/normal_601b50e4a6a66.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/jaihjhZ/cartilage_vocal_cord.pdfIn PDF document text
    • https://cdn.sqhk.co/wemowubire/0ECibjc/aquarium_fish_for_sale_online_philippines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekifaxofezawe.epizy.com/private_instagram_videos_mac.pdfIn PDF document text
    • http://xujamaxopubisa.rf.gd/barredora_manual_rotativa_spin_broom.pdfIn PDF document text
    • http://jojudodadanu.epizy.com/big_wild_thought_size_guide.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_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 5236 bytes
SHA-256: f2104ff667bf671650411119e2538e8e36f6a76ee02f7ebae739caeb6115ee69
font_01_sfnt_off0000eb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB27 10244 bytes
SHA-256: b86850c306c6ae16eed809b2cf049768970d688999b922d143862e5b00f95e83

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