Malicious PDF — malware analysis report

Static analysis result for SHA-256 7956399dc210609e…

MALICIOUS

PDF

105.7 KB Created: 2021-04-01 02:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 123ab7259ffcb80836964769889e9ef2 SHA-1: 8085dbfbf12a9ab773924a89361635788c662f1c SHA-256: 7956399dc210609eefa9b109ae26e3658fef2c22555d2061165113dccaeda708
156 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 0.9977

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 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.
  • 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://dafemum.ru/strik?utm_term=best+online+graphic+design+courses+free PDF link annotation
    • https://cdn.sqhk.co/tidilotofuka/VFQk0ij/59104329022.pdfIn PDF document text
    • https://cdn.sqhk.co/wepaxuwelusu/hiejdxD/24416811038.pdfIn PDF document text
    • https://cdn.sqhk.co/pilozarager/hjn9ZuJ/sisters_thai_food_fairfax.pdfIn PDF document text
    • https://cdn.sqhk.co/kefivaxepaj/GjbHPhh/man_booker_international_prize_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/jaifjfU/62227059645.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/fjcnhhc/8959473709.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/hh28Zih/47527889055.pdfIn PDF document text
    • https://cdn.sqhk.co/keximovib/dEgg0Vq/52913783782.pdfIn PDF document text
    • https://cdn.sqhk.co/fikubife/50OciiD/57435225137.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a413096-4115-453c-84a6-e19f3d0a1e7a.filesusr.com/ugd/4a2d03_00103333c62d425c9ff077e517fd76f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ef5f55-34f6-4dd1-8262-108539adf9fd/22076481073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b8e8d42-00ae-45fb-a330-fc862db584d4/honda_generator_eu22i_best_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b09e6654-a781-4702-8812-78f0754bdbbd/how_to_repair_my_karcher_pressure_washer.pdfIn PDF document text
    • https://b09d99c6-da67-4e55-b5b3-baceba093817.filesusr.com/ugd/a69c6c_8145da751b5b41058b8718d8567b650d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7fddde1-7d54-49f9-8ae8-3bdd955a0789/68128504291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29599842-9d3d-4b6b-aac5-e14fcb71a80f/1838938715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f21b6d5a-cd0b-4ee9-997f-6e734a695018/keurig_2.0_k200_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e008b451-8411-4965-a610-75f9a55af94b/how_do_i_check_the_balance_on_my_ebt_card_pa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2343f4a8-a88f-488e-b2dd-6c7926ae1566/74083141183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04380545-160e-45aa-8344-3decbd3c3848/redenofezidepofigatit.pdfIn PDF document text
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_4cf3d55c866a4a5e93fa6fd24338e0d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a645bc-a42b-4beb-8335-460542cf5ec9/westinghouse_rmt-05_remote_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f963ba-1f4c-4cbd-bb61-1a66085f9ce7/international_journal_of_medical_microbiology_and_tropical_diseases_impact_factor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aa21401-8bc5-4f05-b1fc-65c3d7aec393/7530687924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aea39332-0d32-4198-a233-06886a02c973/how_to_update_genie_directv.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_b937bd5f536d4a47b7c605fbd6939d97.pdf?index=trueIn 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_off00015f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F83 5468 bytes
SHA-256: 312205e0aba8decfe22332195ae62ee567687c05402b01a7c5092d23812f7c79
font_01_sfnt_off00017219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17219 11484 bytes
SHA-256: 2e4dcb0f0d75549ac1f00144fd06906bfea0ab0d71f81a7c6edf9e7ed27f803e