Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24cfa63cf0fc1c1…

MALICIOUS

PDF

75.7 KB Created: 2021-03-03 16:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 65b12ec47ffc09792863f49cc46223c5 SHA-1: 93fb31d59c482e9c1f84072ccdcc76e7d5e92b85 SHA-256: b24cfa63cf0fc1c160f11cadcacab6689f663c37f6662db43e651cb4885288f7
126 Risk Score

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 0.9997

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://maypoin.ru/123?utm_term=rca+visys+phone+headset PDF link annotation
    • https://vafopizinenited.weebly.com/uploads/1/3/4/4/134480139/35efceec2f53.pdfIn PDF document text
    • http://topdouche.xyz/troubleshooting_whirlpool_quiet_partner_ii2y4s6.pdfIn PDF document text
    • https://sekorora.weebly.com/uploads/1/3/4/8/134856449/moxufowimam_kokumivavebelez_rixajoduw.pdfIn PDF document text
    • http://xididefix.22web.org/after_the_fact_the_art_of_historical_detection_chapter_7_summary.pdfIn PDF document text
    • http://qwertyujg.xyz/352030705138iokh.pdfIn PDF document text
    • http://card2card.live/9582409338ycr49.pdfIn PDF document text
    • http://mugedly.xyz/pdf_math_grade_10_answer_key66djn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fakodesugi.epizy.com/96215866006.pdfIn PDF document text
    • http://vezapuro.rf.gd/platform_film_hd_video_mein.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/eclipse_memory_analyzer_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/juminekowuzafovezosu.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/57161983258.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 4992 bytes
SHA-256: 08f526fa1d30b9f6a5dc4c9037f02c3282a1ccc8205637caf7a6f02c7d7227a7
font_01_sfnt_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 11212 bytes
SHA-256: 8c8626bbb164457d8b1ac6dd0da2c5bf5501e1ee590dfa25190af0ec0abf8a01
font_02_sfnt_off00011299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11299 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230