Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b11b8683b25d625…

MALICIOUS

PDF

81.6 KB Created: 2021-01-03 07:05:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bdf6f379c5fd2dd1b952953c508dc8ca SHA-1: e812a4f2bb0657157f9b8e19aa1fbb40e4c16dea SHA-256: 2b11b8683b25d6256587daefb4f2a31fce9d7f424de1ab51a14d38fa1c9cf214
252 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, many of which point to redirectors or disposable hosting, suggesting a link farm designed to distribute malicious content. The document body, though heavily obfuscated, appears to mimic an admit card, likely a lure to encourage users to click the embedded links. The presence of a malicious redirector URL indicates an attempt to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gettraff.ru/aws?utm_term=allahabad+university+entrance+admit+card+2019 In PDF document text
    • https://cdn.sqhk.co/nuzinipaz/iogeia0/halloween_wallpaper_cute.pdfIn PDF document text
    • https://cdn.sqhk.co/zipodumup/jhhhdji/bunk_beds_with_storage_drawers_underneath.pdfIn PDF document text
    • https://cdn.sqhk.co/reserujaj/hbjiYii/lumber_yard_altoona_ia.pdfIn PDF document text
    • https://xusalowaxagus.weebly.com/uploads/1/3/4/4/134481150/89fb41f8332a94b.pdfIn PDF document text
    • https://nobigezikol.weebly.com/uploads/1/3/4/3/134308489/15bbb1c98498f.pdfIn PDF document text
    • https://jofomozali.weebly.com/uploads/1/3/5/3/135387403/0a4980cc5e6a12.pdfIn PDF document text
    • https://cdn.sqhk.co/tovisegag/2khatkq/51761145568.pdfIn PDF document text
    • https://cdn.sqhk.co/gonaxetuped/XTMrRTA/hitman_sniper_game_free_download_full_version.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/juvix-nuzefoxikalilo-mukopavojij.pdfIn PDF document text
    • https://bogigusojuvifu.weebly.com/uploads/1/3/4/3/134316749/fafa3c2d.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/mamibis/bijegodudiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78d60191-c9c6-4ced-b5cd-dea28e994923/78288321494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34df80a1-6dcd-4269-a830-8a9ece0b6e32/sibizofugaribemedisarowow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59a271ef-ef4b-4327-a680-34610ddd1288/nets_of_3d_shapes_worksheet_doc.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_off0000ffe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 5952 bytes
SHA-256: 99325eeca859b1ed94581d281410481e68f475d6ed8502e57d39c3bb0a96eb9a
font_01_sfnt_off00011403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 10868 bytes
SHA-256: 98d971d382cceba9d72546f67aa3b9cb9f86bfaaeca3637605879850f44ae131

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