Malicious PDF — malware analysis report

Static analysis result for SHA-256 338e8bbe2d803f9d…

MALICIOUS

PDF

133.7 KB Created: 2021-01-15 16:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b267559046e3cee1a925b24a441b5c95 SHA-1: 235ebbf0be2adb900748fce2762f375d39f20c69 SHA-256: 338e8bbe2d803f9d58ef308461b89690100bbab7750c74232b011a8d29654fa0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious websites. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9752

Heuristics 6

  • 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 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.
  • 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://trafffi.ru/123?utm_term=another+word+for+persistent+vegetative+state PDF link annotation
    • https://fomemifeju.weebly.com/uploads/1/3/4/7/134769467/9123978.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415321/normal_5fff4eae2e5fe.pdfIn PDF document text
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/rokokosapugupuwipot.pdfIn PDF document text
    • https://cdn.sqhk.co/pinebiven/hdGVtgS/gatwick_strike_10th_august_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/baveninale/ELjfgcu/excursiones_para_cruceros_opiniones.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402519/normal_5fc04f977605c.pdfIn PDF document text
    • https://cdn.sqhk.co/vojogalu/UhiTlsz/free_casino_slots_games_online_no_downloads.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464869/normal_5fdda1bf412f7.pdfIn PDF document text
    • https://mepifinifiwiza.weebly.com/uploads/1/3/4/3/134334375/df0ef1.pdfIn PDF document text
    • https://wowomake.weebly.com/uploads/1/3/4/6/134679477/zovitalusemilufefok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391331/normal_5fef43d547957.pdfIn PDF document text
    • https://cdn.sqhk.co/derixosu/c3cYlha/teachers_on_call_paraprofessional.pdfIn PDF document text
    • https://cdn.sqhk.co/gasubapo/gg2hfjj/28518163115.pdfIn PDF document text
    • https://cdn.sqhk.co/birofinud/hekjabw/color_detector_app.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/8FgfGjc/mt_rushmore_faces_images.pdfIn PDF document text
    • https://cdn.sqhk.co/menaleratupo/hg3idET/remibipasabobuzar.pdfIn PDF document text
    • https://jisasulozif.weebly.com/uploads/1/3/4/3/134371627/143cd9b5dd21d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0001c424.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C424 27452 bytes
SHA-256: 420b4ce7df6cb5fdfd71b56a5f53eb9c7e37c090e62f03c208a1fdfde4aa3a58
font_00_sfnt_off0001449d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449D 7932 bytes
SHA-256: 89d340fb771e6d89e57eaca12c1fd3aa2371565f1dd33096eadaebab8647767f
font_01_sfnt_off00015f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F64 5412 bytes
SHA-256: 78b7ca01503028d1808c777b498395d100dd536a91cc05fb095c8682233cc001
font_02_sfnt_off000171de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171DE 3756 bytes
SHA-256: fa225930d9e8e301835e16f0e0628a71986d8f6ba25c35a6c9037a23bfeb9403
font_03_sfnt_off00018033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18033 6084 bytes
SHA-256: e7f5a08781aa03e1f7cf076dbb6a92e2a1fe5cd18e1f80b9d0c905e0abb350d1
font_04_sfnt_off000193fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193FD 15872 bytes
SHA-256: 1b6d4c7d353eee14c78cd82054588d8455691c91dd9f18a49bc34c354393577b
font_06_sfnt_off0001f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F4EA 5024 bytes
SHA-256: f7b06ccd59cf8ab96852777f6b5cec61f4597b8a3948b3f2ac504fb742059df2

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