Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd17ba38ed7278b5…

MALICIOUS

PDF

76.6 KB Created: 2021-03-22 01:42:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb573f21e92f92ca509a6e27f935406a SHA-1: 7b3d68ddd960ca746af66b516f66dc8c0666c1a5 SHA-256: cd17ba38ed7278b57e9c18f0d577718540be9afcf99d19699928dea558f0f348
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm or redirection mechanism. The document body, though partially corrupted, contains text related to investment guides, which is likely a lure to encourage users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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=beginners+guide+to+investing+in+mutual+funds+pdf
    • http://nomudepalak.medianewsonline.com/auxiliary_verbs_english.pdf
    • http://familyit.pro/arterial_blood_gas_test_meaning9k2gr.pdf
    • http://small-italy.space/african_proverbs_quoteschvwg.pdf
    • https://cdn.sqhk.co/voxedijudibo/cvGiajc/movie_star_salon_apk.pdf
    • http://saniwigudovo.scienceontheweb.net/tivezuv.pdf
    • https://cdn.sqhk.co/jevamivuvugi/lwxXqq8/eagle_rock_loop_trail_guide.pdf
    • http://webmastervlad.ru/boxamemasevogexokuxew5t8fk.pdf
    • http://smartycredit.info/puzorajejisexrbo.pdf
    • http://vekowen.getenjoyment.net/99087303675.pdf
    • http://meroxisawifagu.mygamesonline.org/84689351306.pdf
    • http://palikexifumalam.mywebcommunity.org/lekijajobufanegu.pdf
    • http://golden-bridge.pro/adobe_creative_suite_for_mac_price7woow.pdf
    • http://mnogoturov.com/65496596546c2ke6.pdf
    • http://snatural.space/kubuwulisuseravolikew17rwv.pdf
    • http://dogalijun.scienceontheweb.net/vigovelewipepobul.pdf
    • http://zhigina.ru/what_are_five_common_strategies_for_resolving_conflictsuyrf7.pdf
    • http://korixoludofuguk.scienceontheweb.net/aeschylus_oresteia_agamemnon.pdf
    • https://cdn.sqhk.co/bexoninodag/BgiWibV/akeelah_and_the_bee_2006.pdf
    • http://kolagozisil.mywebcommunity.org/what_does_a_big_spider_in_your_dream_mean.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/94e3db3c-2e42-4c60-b8c4-de148e20bcde/sobijafabeputazepuj.pdf
    • https://uploads.strikinglycdn.com/files/b7faf708-35d8-42c4-a819-3b163ca3d64c/is_sage_crm_any_good.pdf
    • http://tivakifuzir.atwebpages.com/xulijiwazatuxijofutepi.pdf
    • https://uploads.strikinglycdn.com/files/173e67e5-2956-4705-9320-dde84c43f7ca/98487514327.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebed.bin
9a9b20d36b5972ff07986d5f52b56085d172dab2e5acdfc2eb61efd002630eab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 5472 bytes
font_01_sfnt_off0000fe7c.bin
c787cbddaf4f2041d08b68f003353a3d1232d1cde2e13d41b1bceb6c2e9afb34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7C 11200 bytes

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