Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f44eb9c453f891…

MALICIOUS

PDF

77.9 KB Created: 2021-03-16 18:50:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fdec7d294197b9a6838f06c913699980 SHA-1: 950cc954e61dbe05be442848303bf9707270a6b3 SHA-256: 09f44eb9c453f8916b0ec4030b0c0c1059801af93d47a59ebd1a89301275cd3e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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 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://kuzutuzo.ru/123?utm_term=appbounty+free+gift+cards PDF link annotation
    • http://rrrrkkkkk.space/sportcraft_electronic_dartboard_dartsmvxcs.pdfIn PDF document text
    • http://ceter.xyz/79539651664ffjjd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/5180986849.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/samsung_scx_3405w_toner_error.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/dungeon_master_guide_3._5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a19a75e7-aecc-43e6-8c86-7814f9be647d/tojubije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd846f57-d214-4c86-9c73-780962c35f06/75195940061.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/the_economist_22_december_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3944c9c8-a93c-4f43-be27-03459d0abb80/hyderabad_chatal_band_songs_mp3_download.pdfIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_17ae212e02924a06bb747e5a0ff4de2f.pdf?index=trueIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_7a673520cf5848a3ac61cc0ce85835a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/25225317490.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/lafukixuxemurup.pdfIn PDF document text
    • http://kenuxiximusopev.epizy.com/volume_booster_goodev_apk_full.pdfIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_1b6dc80faa6849e3baa83ba636ded00e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/aditya_birla_mutual_fund_sip_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/gigabyte_z390_aorus_master_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/287976aa-8d67-4a64-b693-554db2ecea23/how_to_adjust_hook_timing_on_brother_sewing_machine.pdfIn PDF document text
    • http://noxofovamoz.epizy.com/31055539424.pdfIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_aff13ff226904866b7c98d016c31eb7a.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_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 5524 bytes
SHA-256: 44b8868e959aee05cc31d841cd760b92708e1ec7cbfc1c9c23e127f3deea3455
font_01_sfnt_off000104d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D3 10892 bytes
SHA-256: b695306dfa4a9e9081141e698158443769edb3608544493c5f13d3bbd269af58

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