Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2da935928b8c4f…

MALICIOUS

PDF

92.0 KB Created: 2021-04-27 17:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 05f243ab8ad944c13a97e14aed9e1505 SHA-1: 47c71cbc62e3258477aa42fbc2c0bd4376f2147d SHA-256: 8a2da935928b8c4f004c76d48235cd6eaa2c19f9c7dd5640415f12683d6557d8
126 Risk Score

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 0.9982

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 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://jottigo.ru/strik?utm_term=rita+mulcahy+8th+edition PDF link annotation
    • http://purpless.vip/9089658928pjk0p.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_60121c8a9355e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419003/normal_5fea17695a296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489244/normal_6014cc0461402.pdfIn PDF document text
    • http://umniashka.ru/harry_potter_porn_fanfiction7e2qc.pdfIn PDF document text
    • http://iranomics.com/71251184431f5s21.pdfIn PDF document text
    • http://totalcreditcheck.info/how_to_fail_a_psychological_evaluation8eu4z.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/e47a7be7-4775-4789-85ed-898d15a22fd3/manojapaluk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8fa395a-94ae-430e-87e3-5d71ade32271/14135821939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1819f878-daab-4ea2-9d38-583f0ec55e46/99430934167.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/access_control_system_components.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4adb90-5e76-4eeb-80a7-431ec7d3d3b2/how_to_replace_battery_on_moto_g6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8471ac6c-df51-4945-8a4f-815d819e9f19/3344380191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33cbfc71-8246-4379-bef1-fa0c37cac571/best_all_purpose_10_inch_table_saw_blade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6545abfb-18fb-4224-88fe-5ca2b7df63e7/fonas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40de5631-bcff-4805-af1f-ceb57f022160/nadewiterot.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/55323166145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d3de6d9-f4f9-497c-a294-523c9673e5ef/convert_garageband_file_to_mp3_on_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a679ff7b-66d3-48b9-ac95-5b1cacc11576/voodoo_lab_pedal_power_2_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e9af432-8f50-4bf5-b2a7-e78e75a921bf/27744055607.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/before_the_rains_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/lunorifosaniluz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A79 5208 bytes
SHA-256: c18fb30f781111502b66aed5443b5e4f3976fbf0ae0f6ea5b77001e36c4ea168
font_01_sfnt_off00011c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0B 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00012499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12499 11888 bytes
SHA-256: 709c5c02a2ed86e633b44d319e60bf9bde8daa2363a727f3786f31dd8f0111e2
font_03_sfnt_off00014bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF9 16396 bytes
SHA-256: c8c44e39d81d1a03bb9d571309d5d65bc371ea73ddd4f6668bfca6ee2b05bbc3