Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7262ab587815cfe…

MALICIOUS

PDF

81.6 KB Created: 2021-04-05 17:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ca6d3c58ab9ba495a99de083448ae5ca SHA-1: 893d12eb9ac2e779bf41bea0c706f8355360e285 SHA-256: a7262ab587815cfe427bae35039eaac72b06b06b9436e04391f5b7dfe4e5190b
186 Risk Score

Malware Insights

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

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 0.9967

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=accounting+internship+cover+letter+pdf PDF link annotation
    • http://jiwafuwik.22web.org/53260730994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_606a3c5663b00.pdfIn PDF document text
    • https://jibigevemur.weebly.com/uploads/1/3/0/8/130873945/rogupaweponu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419425/normal_600ec2926b510.pdfIn PDF document text
    • https://videxufukeremon.weebly.com/uploads/1/3/4/5/134504533/15bb30.pdfIn PDF document text
    • https://mepanegeloja.weebly.com/uploads/1/3/4/7/134759112/272de299e7874.pdfIn PDF document text
    • http://rilotelexewobos.iblogger.org/32946845169.pdfIn PDF document text
    • https://pivubetipu.weebly.com/uploads/1/3/4/3/134328131/5256351.pdfIn PDF document text
    • https://mixajogidevo.weebly.com/uploads/1/3/0/9/130969427/munuxamavi_vuzezatedudasib_muloledok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370764/normal_5fdf93ee50654.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6fd1326-0681-463b-9447-b67e0e8906d0/derawafoselipurazijiwomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d4142e1-522b-4c4a-9f0a-77aedf32eafb/what_is_the_effect_of_rhythm_in_a_poem.pdfIn PDF document text
    • http://bilexijo.rf.gd/shirley_valentine_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063101d6-27bb-4e1f-9994-0d0cfbb5598c/nuance_trial_watermark.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/manual_paper_cutting_machine_15_20.pdfIn PDF document text
    • http://tarusuja.epizy.com/ranakilipanijodukazebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b06db7ab-19ea-4c49-89b5-1fd40a210997/im_a_child_of_god_yes_i_am_song_download.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/50649598246.pdfIn PDF document text
    • http://gabazozota.epizy.com/why_is_planning_important_in_early_years.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/royal_caribbean_alcohol_package.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2560ae5-39b3-45e1-8093-06dc67613f06/78642015344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4bb6e3a-d3ac-4c20-b24c-5f0b6e9aa79d/how_will_you_define_public_relations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/014ea003-3a16-474f-8eae-64632cc1ea38/bella_dots_collection_12-cup_manual_coffee_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec114fc1-2f7d-4090-8c5c-a66ffee529e8/20272073101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/129ef32b-172f-4a6d-8191-ecf05e88e662/dd_online_tabletop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd9f12b-7be8-427e-8f3c-238f2ad368f6/my_polaris_pool_cleaner_tail_not_moving.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 5256 bytes
SHA-256: 8c27d70248b7ffa00f75b15d3b605453be57f08b421da9f6cf55daa42470c38c
font_01_sfnt_off000112ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AE 11180 bytes
SHA-256: 180afa02e73e4b0766c1adf3e2cc51c1b33d5c2c76718ddc22cd15e84c929064