Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c10e686f4c73317…

MALICIOUS

PDF

93.9 KB Created: 2021-04-16 14:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8f21923201ae43c9d33bd5973bb0a8a4 SHA-1: 1709479ff599fdffe344ec09749b254ed3d75863 SHA-256: 9c10e686f4c73317f5ac7ded1e9deced70333f47c0a2921aad414eb1448e3737
166 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 0.9997

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/strik?utm_term=is+planet+fitness+open+24+hours+a+day PDF link annotation
    • http://tibetterrier.ru/fanofajuselafaleginisopnydsr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_6054bc006feab.pdfIn PDF document text
    • http://igme.site/91391116749ucgv6.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/euujiic/change_license_plate_number_california.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470835/normal_604a4a0fab5d1.pdfIn PDF document text
    • http://istlan.fun/ethical_hacking_books_for_beginnersmuucl.pdfIn PDF document text
    • https://cdn.sqhk.co/guvawatuzax/bkjiVij/super_boy_kart_dash_gamecube.pdfIn PDF document text
    • http://onlinesos.tech/56100885823axat9.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/6781044247347f3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458417/normal_6006d4ef11533.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421215/normal_5ff685e3001b4.pdfIn PDF document text
    • http://italywow.space/nazefilaxagodapogufatajwuom1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467030/normal_5fe48ea3d9c96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_bca906a997864647ab695e2e1a50a076.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7645529-fdf3-48f8-bb45-6a68e107ec4e/how_to_memorize_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3bbd1d4-1f86-4a20-914d-e424c335b368/rosencrantz_and_guildenstern_are_dead_study_guide.pdfIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_8cb310e688b444c880cdc9e1567761d0.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
    • 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_off000118fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FB 5388 bytes
SHA-256: 80d7c8cc22c8d851ce89225e3a236020a202d3ec7dde05d73dfa767a9e23370b
font_01_sfnt_off00012b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5A 12212 bytes
SHA-256: 3a8080cc3e6ecf4f197e0db379324c7ede556caa4ef1063aff900bc61c5e65f3
font_02_sfnt_off00015582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15582 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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