Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf43b946e839a97…

MALICIOUS

PDF

76.5 KB Created: 2021-05-01 19:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 10fcc53d10011daa7ad76f821e87d233 SHA-1: 1aaeecd0e04fb84b6113a114a4e5bd24b2e7e98b SHA-256: 9bf43b946e839a97df049417c4a75797cd14e977543fa969c1f8d43fcbb08909
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 0.9998

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://ponafet.ru/strik?utm_term=hp+psc+1315+reset+ink+level PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382953/normal_5fd71baf79bb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427293/normal_604a4ba35b34b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370530/normal_5ff54aca19304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419630/normal_6042e1aca2025.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/brother_mfc-6490cw_driver.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409621/normal_60053bf289a03.pdfIn PDF document text
    • http://tokiridevifo.medianewsonline.com/awakening_the_heroes_within.pdfIn PDF document text
    • http://vegoletox.medianewsonline.com/fundamental_mathematical_statistics_gupta_kapoor.pdfIn PDF document text
    • http://fizarumokugafu.mywebcommunity.org/ximexad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wabipoxagapez.rf.gd/thomas_calculus_1_11th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f0fb0b-603f-43e8-ae29-a3143ea1f626/snapper_rear_engine_lawn_mower_for_sale.pdfIn PDF document text
    • http://totiwofosu.epizy.com/no_adverse_information_meaning_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee467f6a-d66b-40b3-b7a7-b830237bbcc8/icewind_dale_2_cheats_max_stats.pdfIn PDF document text
    • http://rugogeke.rf.gd/chemistry_class_11_chapter_1_notes_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c9dec8-20ab-48ca-aa71-585b3c2544ab/how_to_evict_a_live_in_caregiver_california.pdfIn PDF document text
    • http://xizajitidug.rf.gd/metric_conversion_worksheet_grade_6.pdfIn PDF document text
    • http://suwiwomuve.rf.gd/body_ritual_among_the_nacirema_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d44d5866-f2a3-4d91-a885-28f8436413de/28652965363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fe01673-f90e-4fd5-b1be-4f77a10c995d/41373731012.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 5144 bytes
SHA-256: b1e8fa942df8976f19c79c7eaa05b9bec066cd922b41a0f49fb8ef39b8ca7d0f
font_01_sfnt_off0000e9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 10752 bytes
SHA-256: 95a3e6faef88d3228507cbb0f947c678bca6cc94cadff11dd076543fde742134
font_02_sfnt_off00010f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F03 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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