Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a638c7e36ed51c8…

MALICIOUS

PDF

82.5 KB Created: 2021-03-18 05:04:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79c4cd6f0dbf2c61776787c9519cb331 SHA-1: 7fb1c255a3826c193eafc22b7e8e81035f3a7e0a SHA-256: 1a638c7e36ed51c8b1fd1442f0e0e6d3af308e3ab9f0533e819ae975bd92028d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as construction or technical manuals. The heuristic PDF_SEO_LINK_FARM indicates a link farm, suggesting the primary purpose is to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=cellink+neo+user+manual
    • http://xepuxupipe.mywebcommunity.org/why_is_fridge_leaking_water_inside.pdf
    • http://mibilivo.scienceontheweb.net/57534691810.pdf
    • http://gobitujesan.scienceontheweb.net/2020_year_calendar_printable.pdf
    • https://cdn.sqhk.co/rudixika/icCyjf0/83396712231.pdf
    • https://cdn.sqhk.co/rolidofajug/jjifIjc/93597687596.pdf
    • https://cdn.sqhk.co/vibupiwoxaro/KZibWie/broken_arrow_tamil_dubbed_movie.pdf
    • https://cdn.sqhk.co/kixagixupo/ChAgjgi/ginumamami.pdf
    • http://labifovejes.mypressonline.com/business_organisation_and_management_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://malebowepapin.epizy.com/what_is_structural_framework_in_construction.pdf
    • https://s3.amazonaws.com/vovopafubipu/goaliath_54_prodigy_in-ground_basketball_hoop_installation_manual.pdf
    • https://s3.amazonaws.com/tinivukedeta/holt_pre_algebra_homework_and_practice_workbook.pdf
    • http://ketanuviz.epizy.com/reloz.pdf
    • https://s3.amazonaws.com/feseni/us_ending_explained_son.pdf
    • http://zepuwiz.atwebpages.com/english_advanced_test_download.pdf
    • http://jolavewavesuj.epizy.com/ireport_config_java.pdf
    • https://s3.amazonaws.com/gopifu/63855644068.pdf
    • https://s3.amazonaws.com/metubevozisul/fogavutug.pdf
    • http://virefixifefuke.epizy.com/jovatotirisij.pdf
    • https://s3.amazonaws.com/metakibeme/nabebe.pdf
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_0a21e1d83d354c1084e7eec51b53ff0a.pdf?index=true
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_c04c2d40a58045918a844315d341a65e.pdf?index=true
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_d5080c6c3a4442cba526d48b39dddd6f.pdf?index=true
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_fe00e18496b2424eb459782735391eeb.pdf?index=true
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_f61fff9f2f2b4cbbb434c149e7cf749a.pdf?index=true
    • https://s3.amazonaws.com/xilasisefi/84362811722.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f908.bin
4dafe4f813e468bdad1ad6a946b81afeb95dcb5d317bd92924d905ed259e28d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 4720 bytes
font_01_sfnt_off000108e8.bin
0175c56afe7e696edd8fb3770ce1b1fb4b4c8912ddaf3f21141c45a94f7752ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 10984 bytes
font_02_sfnt_off00012e5f.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5F 4324 bytes

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