Malicious PDF — malware analysis report

Static analysis result for SHA-256 550ce105ef92f782…

MALICIOUS

PDF

80.6 KB Created: 2021-03-19 17:05:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 32b31e5523e831f6048131bde87a3e2a SHA-1: 7b983cef7d38b61e8e4bf9fc77b198ff53100ec3 SHA-256: 550ce105ef92f7828c42d2fb7253137269bc86140bf498715b8388e8e6aff10e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary external URL, https://jumiwimov.ru/award?keyword=bnf+pdf+2020+download, is likely the intended destination for users seeking "Bnf pdf 2020 download". No scripts were extracted, but the PDF structure itself is used to host and present these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://jumiwimov.ru/award?keyword=bnf+pdf+2020+download PDF link annotation
    • https://dakewamegiru.weebly.com/uploads/1/3/5/3/135305658/dawokanad-puwumofaji-zejitudupoz-zibikif.pdfIn PDF document text
    • https://gijopufiri.weebly.com/uploads/1/3/1/3/131384250/1487088.pdfIn PDF document text
    • http://logoped-samara.ru/61367936120d6pvn.pdfIn PDF document text
    • https://sidomepavoresob.weebly.com/uploads/1/3/5/3/135322675/nivorexese.pdfIn PDF document text
    • http://armada.technology/fcr_carb_tuning_guide0e8t9.pdfIn PDF document text
    • https://dipafasimabake.weebly.com/uploads/1/3/1/1/131164320/2661694.pdfIn PDF document text
    • https://ranemexamegen.weebly.com/uploads/1/3/4/4/134440137/7353534.pdfIn PDF document text
    • http://pasetbs.xyz/49002273804z252r.pdfIn PDF document text
    • http://vnatural.space/kart_racing_pro11sej.pdfIn PDF document text
    • http://defi-bet.world/is_percy_jackson_on_disney_plus_ukc3uh6.pdfIn PDF document text
    • http://idealicaitaly.site/zajiwibilomuwezizitapadacyxh2.pdfIn PDF document text
    • http://dnepr24.info/blackbird_sheet_music_flutec4imu.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://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_900b50e662f342a5871cbda1a84a9b78.pdf?index=trueIn PDF document text
    • http://vavubal.epizy.com/hydraulic_power_unit_design_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/409bff84-e70e-40e9-8d01-84660de21bda/86742804390.pdfIn PDF document text
    • http://fimibujoreza.epizy.com/how_to_explain_senses_to_preschoolers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0bdd9d3-e1e4-4327-ac95-35955a882bfb/sears_air_compressor_regulator_parts.pdfIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_3d9c2ce67832485bb452b3d6d32a12fe.pdf?index=trueIn PDF document text
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_2609b3819d8d45268043fff5fd06bf76.pdf?index=trueIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_404089a9520f4978a2a9af49bc11d391.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0071fd32-0865-4371-bedd-356b79fcd6b1/lifizuxixokibefor.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_0d8d98e55c0746f6ae4ef529ed4150a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/937a1ceb-a257-484f-a5a2-21e87196b750/jugegeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5565f773-65d9-422b-99ec-732f53049e8b/11_day_diet_fat_loss_for_idiots.pdfIn PDF document text
    • http://pajimej.epizy.com/gigela.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 4716 bytes
SHA-256: 87fdd8b5e3a53833772bcb06f9919e7b992ada20f1f9a63d7c886722dca37813
font_01_sfnt_off00010213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10213 11180 bytes
SHA-256: 0d1fa1c5ce8bdc3b0e9104a8276d2e19e18dfb7eb0c4c7936d5c9d0211636e94
font_02_sfnt_off00012719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12719 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34