Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d3b583e599728a…

MALICIOUS

PDF

76.3 KB Created: 2021-06-01 21:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 196909be6e8bf9d82730c14aed383ff0 SHA-1: c1c2257dcec2ad3d02d16e8f989bfad4538c62e1 SHA-256: 66d3b583e599728ae8de34c0cf523b7b1023c6d690d228f1df86f0fd2f134ced
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/pbw?utm_term=an+introduction+to+brain+and+behavior+bryan+kolb PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404965/normal_603c5cb554184.pdfIn PDF document text
    • https://pefasuvut.weebly.com/uploads/1/3/4/7/134716349/vopalagosa_pesegugiva_fanawojut_lefefim.pdfIn PDF document text
    • https://wakazezoloke.weebly.com/uploads/1/3/3/9/133999839/8186587.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459057/normal_5fed56883ca74.pdfIn PDF document text
    • https://zakisegozazamig.weebly.com/uploads/1/3/4/3/134346543/nipoxezifuv-jiniligosu-fewawasolusivu-pobusosaxamas.pdfIn PDF document text
    • https://xebutikud.weebly.com/uploads/1/3/0/8/130813588/4360078.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://dimutojopog.pbworks.com/w/file/fetch/144445110/sanam_teri_kasam_mp3_song_downloadming.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/bloons_td_5_free_ios_download.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/28667186608.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/w/file/fetch/144414645/spirit_bear_book.pdfIn PDF document text
    • http://veweran.pbworks.com/f/zofixunawikatiwebarudono.pdfIn PDF document text
    • http://dekokos.pbworks.com/f/68159437058.pdfIn PDF document text
    • http://bojirakaj.pbworks.com/f/1176114755.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/ganozofafonenow.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/viveputel.pdfIn PDF document text
    • http://feteselulo.pbworks.com/f/torutabizoduvewuwizav.pdfIn PDF document text
    • http://zegugas.pbworks.com/w/file/fetch/144427803/o_que_significa_cosmologia_e_cosmogonia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2ea51a5-1f80-4475-8c51-ba3023531844/71445713348.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/w/file/fetch/144453276/bozezuwifirojagawof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf1ae301-284b-4a06-8f09-5f02339a08b0/computer_bookkeeping_and_tax_service.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_off0000e1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B9 5084 bytes
SHA-256: ce15eada0c9b215759f459351ff3ba4456ffd3b7ddc57d9c7831e517228c82ab
font_01_sfnt_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 10196 bytes
SHA-256: 81fb5de8f4e8275b93c435a24e6b6c577d1837d8a1a17ceca20fa0db3b7794bd
font_02_sfnt_off0001157e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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