Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a34e888ce3ce544…

MALICIOUS

PDF

107.5 KB Created: 2021-04-09 07:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5a107fa97b01fadcd93f99ae13493728 SHA-1: b80d3c7a7f4dc1a2aa2567dc25c930afc069808b SHA-256: 8a34e888ce3ce544c73d4ec46db457eeefeeaaa3d1f8aa625754fbd64c8fc46b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to obscure the true malicious destination. The primary malicious URL identified is https://soxebez.ru/strik, which is likely used to redirect users to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://soxebez.ru/strik?utm_term=what+does+ibn+mean+in+arabic PDF link annotation
    • http://trydouche.xyz/apsacs_date_sheet_2019_class_5cnzr2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377114/normal_602a6d151751e.pdfIn PDF document text
    • http://opensalon.xyz/ditajimonolzfcq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_6032096dba11d.pdfIn PDF document text
    • http://instapriz.website/cuantos_milimetros_tiene_un_centmetro_cbicor4bze.pdfIn PDF document text
    • http://lefefegibilapo.22web.org/jisad.pdfIn PDF document text
    • http://dedotiroviwef.22web.org/8911814070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464072/normal_6063cf5f74140.pdfIn PDF document text
    • http://msertis.xyz/matthew_hussey_marriage1oks6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464314/normal_605aa09d8f249.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/busutafitufe/52276292206.pdfIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_03bd64c61f56402b817f30febe70e020.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7cb1745-2930-43a0-bd97-3ccafdfebd70/xegusewif.pdfIn PDF document text
    • http://dilexaluv.epizy.com/bisojonoduduluboserubevon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1af0a3-3b33-43d2-8f99-71adc219e9e7/at_what_time_do_they_close_walmart_today.pdfIn PDF document text
    • http://jovozovoxisuno.epizy.com/apa_style_paper_sample.pdfIn PDF document text
    • https://1437f3f1-f978-4e1b-9120-555090070881.filesusr.com/ugd/d4ef56_b332dec1e60747a687bf9d408fb90e13.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fujadabez/best_happy_birthday_song_audio_free.pdfIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_0ab24237af984893a396befbd6a15714.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4817470-4381-473b-891f-a346b4a232dd/tikujaxuxurazobib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37f777b1-95a5-4237-8256-75808f5bfbf1/revesas.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/dan_brown_books_in_order_of_writing.pdfIn PDF document text
    • https://40c507a3-37b7-491f-afd3-f28ba3af1fb2.filesusr.com/ugd/7f5264_a68b31c62212480ab5cc239c75489d0b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/88550871753.pdfIn PDF document text
    • http://fofeparulofiz.rf.gd/67053962835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6ffa678-932d-4886-a4e4-f1ac4cf59494/xarosuzaso.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/gumudus.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://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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00016c9c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16C9C 28444 bytes
SHA-256: c9f90a716a51c3e20fefe18993933f255c03ffd6cfef358f8e9543431c43d576
font_00_sfnt_off00013321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13321 5300 bytes
SHA-256: bd3b4fe5eb57cfff6fd7819e5da623a09b36d06d810a93418e269389de4bb768
font_01_sfnt_off00014505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14505 11580 bytes
SHA-256: e6e47fc2614b70ba2cf9d457319bfef5da8723e727ecd9e7cccbe79a6a02db4e

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