Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c90dc0604d4cb5…

MALICIOUS

PDF

81.7 KB Created: 2021-03-19 08:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bb89d6452032ffe0ee9e3d8c314f7b7d SHA-1: 27311234a89c20b7e0f02330f1d5d8335145dd7e SHA-256: 17c90dc0604d4cb50570b8188273b847580a2fe78f1f55832daaa140afaa4326
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the URL 'https://yafferge.ru/award?keyword=adverse+childhood+experiences+uk+pdf', which is likely used to lure victims into a phishing or malware download site.

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/award?keyword=adverse+childhood+experiences+uk+pdf In PDF document text
    • http://gipogup.sportsontheweb.net/girejijowiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393483/normal_5fe0ddc265453.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490722/normal_6039d62e60ad6.pdfIn PDF document text
    • http://loziwazekon.medianewsonline.com/fidusafabiguwera.pdfIn PDF document text
    • http://berasowugixo.mywebcommunity.org/75232668653.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417122/normal_60308816dc09d.pdfIn PDF document text
    • https://pelosewedi.weebly.com/uploads/1/3/4/7/134753512/1748c84eebaf7.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/how_to_update_nexus_10_manually.pdfIn PDF document text
    • https://cdn.sqhk.co/simunenij/EijbJo4/pixels_hot_wheels_race_off_glow_wheels.pdfIn PDF document text
    • https://gazezujebek.weebly.com/uploads/1/3/4/8/134881616/4492238.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/gogotedemu-riborazulesapob-mujowarovut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447464/normal_5ff67a9337c6c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_1b1e230f638749d98844913c9f79dca8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/coastal_geomorphology.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/negupanavoribemi.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_808723ab716e4905a2c173878dff40ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/linomoz.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/slow_blizzard_speed.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/56034826067.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_off000102c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 5212 bytes
SHA-256: 161f61a18b148503c7e410fb9fae2bb7036d6f596ce06ecc06dab185f5b88f26
font_01_sfnt_off0001148c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148C 10832 bytes
SHA-256: 5e2ce46248ec6f94cac36416cf96a505899b6f5675fa61833c5b4dfe10005b1a

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