Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa20c4f481797c86…

MALICIOUS

PDF

80.4 KB Created: 2021-03-23 23:56:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f52ed019e42d93b4dd4fb0034432d0f6 SHA-1: 5b60885d2cfd117bd98e86d1d941626b2d805830 SHA-256: aa20c4f481797c86e0b3dbc731028de90c1902236c533477c6378b1c313d1d02
186 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 0.9998

Heuristics 6

  • 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.
  • 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://midufefew.ru/wix?keyword=itech+smart+watch+manual PDF link annotation
    • http://hangookoil.ru/pokemon_emerald_gba_download_iphone6wo4r.pdfIn PDF document text
    • http://xelipev.22web.org/86974777519.pdfIn PDF document text
    • http://educationonline.website/axial_scx10_2_kit_manualvljmc.pdfIn PDF document text
    • http://jushq.pro/ramijimofemipqdume.pdfIn PDF document text
    • http://krokoboko3.xyz/rinulon8fr5z.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://s3.amazonaws.com/vovuzize/why_does_the_left_side_of_my_earbuds_stop_working.pdfIn PDF document text
    • http://mubaviz.epizy.com/93574964595.pdfIn PDF document text
    • http://volajigatume.epizy.com/61291932938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dd52bd1-449f-47d0-9ec6-9bd5baf04154/86028132576.pdfIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_7ab89a4efb39422cacb3a50bc3ac953b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be2130b-9c9c-449e-b407-6a22a50c44cd/11994682945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/061f32a1-9f40-40f8-acb3-b631c155a019/zividuveridufawewutif.pdfIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_b6b74d1d531443c6ae2fe26efccd3b35.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jipowumat/four_freedoms_speech_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c251139b-808d-4c09-8afb-21a418277c42/what_is_the_correct_air_fuel_ratio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69bb6b46-df03-49f8-8a7f-e4c8c0b78e7d/67604386233.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/gewezoliweba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c779e81-2d0b-485a-b776-657dadebfd2e/spt_air_conditioner_and_heater.pdfIn PDF document text
    • http://rerivumisiso.rf.gd/long_and_synthetic_division_worksheet_answer_key.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_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 4792 bytes
SHA-256: de767ba789c803459501b50f72f52a21ea32f2ab4ecab61d3507a73ee9dbdbeb
font_01_sfnt_off0001023c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023C 10484 bytes
SHA-256: 0188590845ae0f21793953d84da8eb2365858e4f53ba51e2f0d2e9a416cf4835
font_02_sfnt_off00012628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12628 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333