Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1157b7deb5bb7ff…

MALICIOUS

PDF

86.9 KB Created: 2021-03-09 19:50:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 293c460b5611745ab106fa00340445d4 SHA-1: bc08de90ae07232bcab1d90f2b3a14043e75e7ac SHA-256: f1157b7deb5bb7ffac3ef3edba70682967d57564e32ede40f76cbd103048eb88
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. One prominent URL, https://jacksth.ru/award?keyword=legal+and+general+pet+insurance+claim+form+pdf, suggests a lure for phishing or scamming users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://jacksth.ru/award?keyword=legal+and+general+pet+insurance+claim+form+pdf PDF link annotation
    • http://sepukolobu.sportsontheweb.net/bodyweight_exercises_for_upper_body_strength.pdfIn PDF document text
    • http://mareson.getenjoyment.net/85412975679.pdfIn PDF document text
    • http://xarapover.mygamesonline.org/25193959059.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/g5icb0K/bumafesedipam.pdfIn PDF document text
    • https://cdn.sqhk.co/mafulavet/i3Njihg/stream_from_xbox_companion_app.pdfIn PDF document text
    • https://cdn.sqhk.co/tojebaru/cggjemc/wodamesufizexoguxenagewep.pdfIn PDF document text
    • http://zezarujewida.iblogger.org/charlie_chaplin_comedy.pdfIn PDF document text
    • http://wubowobipevoto.mywebcommunity.org/learn_english_online_free_course_audio_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/5poywjW/first_words_project_parent_portal.pdfIn PDF document text
    • https://cdn.sqhk.co/wiparodub/ie4jiLh/jerapeboborozonekazom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fojakosi.atwebpages.com/gigujagifalibun.pdfIn PDF document text
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_c5604dac95bc4785980b95e2646b6521.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liguwubore/bagezakiditomezojirute.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/soundbar_jbl_sb450_manual.pdfIn PDF document text
    • http://wegugoleta.onlinewebshop.net/what_is_the_meaning_of_modern_political_theory.pdfIn PDF document text
    • http://nidikofuwovi.rf.gd/charlotte_s_web_worksheets.pdfIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_f1e8a24d6b5e4305b104af3bf5b3a5a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovugi/enzyme_kinetics_lab_report_hypothesis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001011c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011C 5416 bytes
SHA-256: 185a1ce0a04db36d846c72f345cc7050d7878d3c280daa37ac376b1b30bc8932
font_01_sfnt_off00011377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11377 10848 bytes
SHA-256: 6b6f8b7b7c241a4868430c1d3cdfb92c15b9de99477aeef6ef8cd6ecfb88fe9b
font_02_sfnt_off000138b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B6 16144 bytes
SHA-256: f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29

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