Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af7279b4029d231…

MALICIOUS

PDF

77.9 KB Created: 2021-03-16 21:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 577a92413dee69c715540a1b0002a766 SHA-1: 994198e2122e3d7a44f3f5d2f81b3b0f33e17ab3 SHA-256: 4af7279b4029d231f856fff737a151dd99688c2dc0208cf6fc185b7b9ff8d61e
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 0.9994

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://jottigo.ru/award?keyword=astor+piazzolla+tango+etudes+saxophone+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384026/normal_5fd79c46b7d5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471275/normal_603673ec1df56.pdfIn PDF document text
    • http://scrlt.xyz/what_is_machiavellis_purpose_in_writing_the_prince0nk53.pdfIn PDF document text
    • http://muldwych.com/gotomoraxoroxotepefebuxid63mm.pdfIn PDF document text
    • https://lupamotikodoja.weebly.com/uploads/1/3/1/4/131406453/dazoranekinu.pdfIn PDF document text
    • http://auto-fishing-rods1.club/kugubowamfcoub.pdfIn PDF document text
    • https://tadafemuge.weebly.com/uploads/1/3/4/4/134480681/nesakow_kedenile_vuvot_juxewatedipupa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392199/normal_5fdaf70cdf90f.pdfIn PDF document text
    • http://solent.bar/zofosizosebavulodugenivkoiw8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365601/normal_5fee40327da0c.pdfIn PDF document text
    • https://sorizovebikup.weebly.com/uploads/1/3/5/3/135386894/mufixuzuvi.pdfIn PDF document text
    • http://zikapipumimapo.22web.org/vemobol.pdfIn PDF document text
    • https://babibuxa.weebly.com/uploads/1/3/5/3/135302477/9587540.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
    • https://s3.amazonaws.com/bevekizadoxuj/ielts_listening_practice_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/kitchenaid_superba_side_by_side_refrigerator_troubleshooting.pdfIn PDF document text
    • http://vopepogam.rf.gd/23004946245.pdfIn PDF document text
    • http://votitagupen.epizy.com/aasimar_d_d_3._5_manuale.pdfIn PDF document text
    • http://dedufaga.rf.gd/jokobirefesajute.pdfIn PDF document text
    • http://bisapejavi.epizy.com/how_to_actively_listen_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/gabudofumuxuvurebi.pdfIn PDF document text
    • http://betixaneja.rf.gd/hp_officejet_4630_replace_ink_cartridges.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/74983985124.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_off0000e378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE378 5292 bytes
SHA-256: 134581c829a7895ebdb7de2b90e7ea866a647d271076e810719d62ce98d2f74e
font_01_sfnt_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 10584 bytes
SHA-256: 8fb6f13f7396747dd020465c1f21e69057680e8898a07effc72a0040b7d633da
font_02_sfnt_off000119b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B4 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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