Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bae1077fd77b47…

MALICIOUS

PDF

91.8 KB Created: 2021-03-30 07:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c24f0cdd4ae43c23b9547b7605e66e40 SHA-1: 9e05ca58c1f8c651b1c9ff74653892d87cabb0cb SHA-256: c4bae1077fd77b477d32be692043a5fbb438eb81f59e3380cbf026e99ded9a1b
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed for SEO manipulation. It contains numerous external links, many pointing to disposable domains, suggesting an attempt to distribute further malware or phishing content. The embedded URLs and the PDF's structure indicate a tactic to trick users into downloading potentially harmful files under the guise of legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://zajinet.ru/award?keyword=bengali+book+pdf+file+download PDF link annotation
    • http://lishop.site/68568348048rhdbw.pdfIn PDF document text
    • http://delayikapy.xyz/addition_to_20_worksheets_year_15cvpi.pdfIn PDF document text
    • http://oneitstore.info/nibinajugeqzkgj.pdfIn PDF document text
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/bewejeximus.pdfIn PDF document text
    • http://gagarinski.su/openintro_statistics_amazonwchqd.pdfIn PDF document text
    • http://tikanaw.mypressonline.com/11058782181.pdfIn PDF document text
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/kologedaxusetis-daputobenuperi.pdfIn PDF document text
    • http://lamovingcompany.com/xodidipo4rgdr.pdfIn PDF document text
    • http://fedezin.scienceontheweb.net/active_and_passive_voice_exercise_download.pdfIn PDF document text
    • https://lepoboniw.weebly.com/uploads/1/3/0/9/130969744/7446463.pdfIn PDF document text
    • http://formulamoney.top/jugufebabegiwawogikob8r3o.pdfIn PDF document text
    • https://luzidasagozoro.weebly.com/uploads/1/3/4/3/134319964/fewimobe-nolibaboje.pdfIn PDF document text
    • http://gadatoreneperil.mygamesonline.org/difference_between_systematic_error_and_random_error.pdfIn PDF document text
    • https://zepitobazelaki.weebly.com/uploads/1/3/4/6/134619491/4198034.pdfIn PDF document text
    • http://zudepogumo.medianewsonline.com/mappa_tram_amsterdam.pdfIn PDF document text
    • http://simultaneously.space/how_do_you_get_a_lamborghini_in_gta_5_cheat_pcx9ai0.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://uploads.strikinglycdn.com/files/c305c290-8f93-4d13-8a7d-0762cadca1bc/what_are_warm_fuzzies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05299b07-6a57-4b99-9c72-a924d4bb2c81/4_pics_one_word_level_239_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2f46065-121d-42f2-acee-498f0f2a77da/medicinal_chemistry_research_scimago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4451ffe9-1e45-4250-a540-bdfa829e6735/what_is_the_army_rangers_saying.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c752dc-84d3-4a15-b700-d9875f0bfc10/what_is_kants_copernican_revolution_in_philosophy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d0b724b-3ea6-48fd-93b1-441f00fad6e0/83106940093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a53509a1-5f16-4765-bfd1-aae38107b1a7/cracking_the_sat_practice_test_8_answers.pdfIn PDF document text
    • http://nemenarubaz.atwebpages.com/vehicle_parts_catalogue.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 4988 bytes
SHA-256: de2f95381e7ef113057e734529c1f699781e2f084babb19ca5210657c86fa188
font_01_sfnt_off0000f870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 18244 bytes
SHA-256: b9b9ebf8b882e83ee2299758c4f7ea24a0d819de11b796ffe6b5bf556ff8ba26
font_02_sfnt_off00012c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C68 10700 bytes
SHA-256: 111ad5182e1e1bd2485c719d3a873446a5a1f65253594945b28149ed44a575fe
font_03_sfnt_off000150e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E6 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71