Malicious PDF — malware analysis report

Static analysis result for SHA-256 f763454eabd8cb43…

MALICIOUS

PDF

77.7 KB Created: 2021-03-16 06:43:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e344465d8dbf3ae8b5c68e568d6f0335 SHA-1: 9a7c238959b51f306c421a6137193b27e943eb07 SHA-256: f763454eabd8cb43368a92dddae4d37bc469b59178703a71a821166b4e805bad
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://soxebez.ru/aws?utm_term=tutorial+para+tocar+guitarra+electrica PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471095/normal_6019f466f077f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374196/normal_603893e4f01a5.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/kCBgi63/billboard_hoarding_photo_frames.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481061/normal_5ff043b88dd84.pdfIn PDF document text
    • https://cdn.sqhk.co/jewipabefoji/gUMegjd/81651718623.pdfIn PDF document text
    • https://cdn.sqhk.co/mewovegid/RSeIljj/goalrilla_soccer_goal_net.pdfIn PDF document text
    • http://nigma24invest.online/bowl_pin_strike_deluxe_3dswoea9.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/hegeifL/rolling_stones_songs_in_open_g.pdfIn PDF document text
    • http://phtech.site/24079261304yrt1.pdfIn PDF document text
    • http://excschool.ru/vowifubobumagijajowezoxhhrnp.pdfIn PDF document text
    • https://cdn.sqhk.co/pobumepova/h7hKz4r/pakodotalarik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449783/normal_603b9461d2b6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427809/normal_5fcacd077ab41.pdfIn PDF document text
    • http://betmoy56.com/swot_analysis_word8c8k6.pdfIn PDF document text
    • http://ruwakus.22web.org/eos_rebel_t5_1200d_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460966/normal_601ce19433950.pdfIn PDF document text
    • http://genusadnlo.space/56595547876o4kmq.pdfIn PDF document text
    • http://groshyk.site/88280950835k9cgn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://firixafuzive.rf.gd/76728144026.pdfIn PDF document text
    • http://lowakeze.rf.gd/mojabos.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_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 4872 bytes
SHA-256: a1f5da30fab874e494d64f3db201d454403ffe3b02856a066fd9b92b391d671c
font_01_sfnt_off00010228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10228 11412 bytes
SHA-256: 59be8c887b609b56c2a15a0f722cc6a003d716e19341122aefb3f4d43c7191ab

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