Malicious PDF — malware analysis report

Static analysis result for SHA-256 730dc34080953d25…

MALICIOUS

PDF

83.0 KB Created: 2021-03-17 06:24:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6176d046ead013a71f469c4c9e7ef7e8 SHA-1: 1bb00e9895eb2ef2a1eaade2ffd9657fa72ff057 SHA-256: 730dc34080953d25320a005ff74e1da988467c984cb2a63174d889f9e81438e4
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 0.9991

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://baarspo.ru/123?utm_term=factoring+to+solve+quadratic+equations+worksheet PDF link annotation
    • https://cdn.sqhk.co/fagaxirupunu/hh6hajd/rixisivi.pdfIn PDF document text
    • https://zogadinarele.weebly.com/uploads/1/3/1/4/131409244/352b13edee1758.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373788/normal_5fc5d8e50255f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_6029a7e83b5d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490138/normal_5ff527d3f161d.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/f4hjokH/xotogamide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444874/normal_602117b4878d5.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/jd7ghhf/zaraxewivebiviluzami.pdfIn PDF document text
    • https://dubakaxejevam.weebly.com/uploads/1/3/2/6/132696109/fb6ea519edba.pdfIn PDF document text
    • https://cdn.sqhk.co/rotuzuwibi/gKUhBgc/3095891680.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/2668192.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470542/normal_6006d5067bb6f.pdfIn PDF document text
    • https://samovibemajus.weebly.com/uploads/1/3/4/5/134597991/zivulul-ziriwajope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476272/normal_5fd175c215fff.pdfIn PDF document text
    • https://linoraza.weebly.com/uploads/1/3/1/4/131437671/fakesuferadi-banepozeseb-faxosavusumifu-subewuzoti.pdfIn PDF document text
    • https://wigazasadus.weebly.com/uploads/1/3/5/9/135974004/dijefu_tefojofiw.pdfIn PDF document text
    • https://cdn.sqhk.co/xojugako/aigdEgR/windows_10_update_stuck_at_100.pdfIn PDF document text
    • https://sixalusizefew.weebly.com/uploads/1/3/1/3/131378898/veliro_gozirogutubon_zimom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460057/normal_5fcbdaf963776.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369911/normal_5feeac9d8a2c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fea25cf-ccf0-4822-a505-18ffc4991b84/what_is_the_best_flowers_for_honey_bees.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a929526-1c78-4279-8d2c-c418eaeeb22b/dias_festivos_en_estados_unidos_septiembre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de9cd18-30e0-4d21-90eb-094be25fbbd2/sig_p938_legion_holster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/637e6554-9238-4e01-85cf-90bead81426d/38983246427.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_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 5500 bytes
SHA-256: 9d5f8d0aeec8ed7b58f39c78b18645a84d5dea66faaa4b40929ffd4136d5b4c9
font_01_sfnt_off0001187a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187A 10956 bytes
SHA-256: b5a33aababeb125e7d566088d51b06f13cca8216ca0c8677099da76b1c88af3e

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