Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6308aff8bace146…

MALICIOUS

PDF

74.1 KB Created: 2021-05-17 00:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: fa59bd58bb6bee1aff68e95c86e270ee SHA-1: 14554bd12d074bee064a4b978ba5f123e847dabd SHA-256: c6308aff8bace1465649e0f9cb320a66bc5dd7b8061645ca64603304f7e323af
154 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically 'https://yafferge.ru/strik'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of malicious links within the PDF structure suggests it is designed to redirect users to harmful content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=how+to+lower+basketball+goal In PDF document text
    • https://cdn.sqhk.co/felolavap/me6sVic/ultimate_football_heroes_books_box_set.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/wxnjeRE/mukti_camp_hack_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479707/normal_5fc808b86d0c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482853/normal_6052134fef8bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_601782c22d3f2.pdfIn PDF document text
    • https://cdn.sqhk.co/kogujipubap/hF6ijhi/47555980431.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/jgiQjcW/keximorefunamego.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/Xigjjty/16494104943.pdfIn PDF document text
    • https://cdn.sqhk.co/wefegiwezon/jgXCnjg/58553398464.pdfIn PDF document text
    • http://onlinekartiadesi.com/skype_for_business_server_2015_trialgcd9a.pdfIn PDF document text
    • http://centerbluebadge.com/harvest_moon_ds_guide_book38sj4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446272/normal_6017b50c1ff25.pdfIn PDF document text
    • https://cdn.sqhk.co/bopibege/LhbJOoi/xevoriliwajugep.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/jgksljf/new_hard_rock_music_bands_with_female.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/hbhijeq/xasumupelugaxa.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/novipaliwid/corbettmaths_lcm_and_hcf_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/is_frigidaire_a_reliable_refrigerator.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/vafusiwifosuvapeduzigof.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/2002_ford_explorer_sport_trac_interior_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/pure_love_song.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/mirro_pressure_cooker_22_qt_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/72537480731.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/poulan_p3314_parts.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_off0000e5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 5112 bytes
SHA-256: d44fa4a7bf85ad2fe2d9695e61c5946a293adf5c00b5fa58da3023895d2beb1c
font_01_sfnt_off0000f75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 10432 bytes
SHA-256: f94ceb0ef2a4fd224c0a7dd83277124d65bb6ae77256137191738cbb78e0645a

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