Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c200fac6aff9f5b…

MALICIOUS

PDF

93.4 KB Created: 2021-04-03 15:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c3b0db4dd69a546947b3870f58a9cbd SHA-1: b25830e02a1742ba918d41226db6e7e64399fb43 SHA-256: 8c200fac6aff9f5ba49b6ccfa5d190837c62ae5cf154e6629291c4fcc744e8fa
156 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing or link-farming campaign. The document contains a large number of external links, with a critical heuristic identifying a "PDF_SEO_LINK_FARM". The primary malicious URL identified is https://ponafet.ru/wix?keyword=the+living+earth+answer+key, which is likely used to redirect users to further malicious content. No scripts were extracted, but the extensive use of external links suggests an attempt to drive traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/wix?keyword=the+living+earth+answer+key
    • https://dixawofira.weebly.com/uploads/1/3/5/3/135303501/888aa.pdf
    • https://nunofisodopuw.weebly.com/uploads/1/3/4/2/134234763/dojisaxete.pdf
    • https://xapovakugad.weebly.com/uploads/1/3/5/3/135393008/jajolajalunan-papivuletuvepop.pdf
    • https://suzexefovewav.weebly.com/uploads/1/3/4/6/134640410/podenokuvezarir.pdf
    • https://wizemeleg.weebly.com/uploads/1/3/4/3/134307012/1e19235b6ff.pdf
    • https://tifegoguxefufi.weebly.com/uploads/1/3/1/6/131637953/feresovotis.pdf
    • http://xulazawelinuze.scienceontheweb.net/52080053027.pdf
    • http://bikelumonekodex.mygamesonline.org/what_does_dagon_represent.pdf
    • http://mikovil.mywebcommunity.org/asus_m2a-vm_audio_driver_windows_10.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_dd9322bf52254f8c8e4afe387d524aa3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/92d500a4-85bb-45a9-89c5-15a5f7dcbba8/briggs_and_stratton_550ex_carburetor_part_number.pdf
    • https://s3.amazonaws.com/lusabifef/tres_principios_de_la_economia_circular.pdf
    • https://s3.amazonaws.com/bivanud/42556910376.pdf
    • https://s3.amazonaws.com/bejenosugede/bittersweet_symphony_violin_solo_sheet_music.pdf
    • https://s3.amazonaws.com/zubata/why_did_my_logitech_wireless_mouse_stop_working.pdf
    • https://uploads.strikinglycdn.com/files/19f9e200-616c-4b0e-8bbf-63c867843c21/nordictrack_c800_parts.pdf
    • https://uploads.strikinglycdn.com/files/d36b4182-723d-4559-95d4-3ba0495bdba5/12593582878.pdf
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_942998332e794bac9639589adce71623.pdf?index=true
    • http://wenulusevikofa.myartsonline.com/background_of_the_study_sample.pdf
    • https://uploads.strikinglycdn.com/files/5518517a-ea25-4ce1-8713-ce97f91f0044/circuit_analysis_questions_and_answers.pdf
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_94d14070959a4056b92a5cfdffc790e6.pdf?index=true
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_5de9288117d042c28964aa7221a3cb2e.pdf?index=true
    • https://s3.amazonaws.com/ropidadegaxut/ruvede.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_off00012d31.bin
bb525d0453724281532e9fa6db33885335c44cfcef782a09272b1d61efc59cfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D31 5216 bytes
font_01_sfnt_off00013f04.bin
509c85a55cda71bdf202ea34ac4b16873bb5ce4919761493dbf222d96845c482		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F04 12256 bytes

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