Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda37c3a3deef707…

MALICIOUS

PDF

83.3 KB Created: 2021-03-22 09:52:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b2dfc0fda8cf337234635ba7ca977ff SHA-1: 2a05299323ca5df74dcb2933343debaca0af4a6b SHA-256: cda37c3a3deef7072e443e2648739e4078994f1a56c54ccd8f3dfee089b846e8
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are flagged as part of a link farm or lead to unknown/malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of 'LOLBin token sequence' suggests attempts to disguise malicious activity within document text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=suffix+ful+worksheet+for+2nd+grade
    • http://webdefilmizle.com/17427328972ye8sk.pdf
    • http://gnoogle.site/complete_and_simple_predicate_worksheets_with_answersj0dsr.pdf
    • https://pudukodup.weebly.com/uploads/1/3/1/4/131407572/pafetira_lenedogo_xipasodiduze.pdf
    • http://tufuwavaziga.mygamesonline.org/pemem.pdf
    • https://siradukezud.weebly.com/uploads/1/3/4/7/134711866/wusurinupovig.pdf
    • http://bagomebefekixob.getenjoyment.net/structure_and_function_of_animal_cell_organelles.pdf
    • https://nituxokijawagez.weebly.com/uploads/1/3/0/9/130969825/bagip.pdf
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/telitugoripulaba.pdf
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.f
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a9b7993f-6967-48c1-a2c3-d5bc86fe985f.filesusr.com/ugd/ea2be3_e6ce72417e2e4201bc0bfbfb20cfc15e.pdf?index=true
    • https://s3.amazonaws.com/voxipanovigepiv/bitcoin_wallet_apkmirror.pdf
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_6658b6a9d3e24125a68e233ffff8264c.pdf?index=true
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_ac40cbc29f0345b7ab64e4610f6ee45f.pdf?index=true
    • https://s3.amazonaws.com/xelimewat/who_performed_cats_in_the_cradle.pdf
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_d45858b32e1248dca0a6121632134abc.pdf?index=true
    • https://s3.amazonaws.com/bewibiwat/10_ejemplos_de_teorema_de_moivre.pdf
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_e5f9a047e2be4ffa93c35b850083886b.pdf?index=true
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_7ef8ef28b66c442589ac1c4253d5a2e7.pdf?index=true
    • https://s3.amazonaws.com/xeroguru/proper_barbell_bicep_curl_form.pdf
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_79786bcebb1949ada17e8f85525dca9e.pdf?index=true
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_dadeefbcba5745d986347e4f0af510fe.pdf?index=true
    • 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_off00010387.bin
39cc3c83099b23532d2a625e348c669f1db6830d3977e333a8d03ec4807c6695		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 5628 bytes
font_01_sfnt_off000116c8.bin
4f1db589bde1e69f905a5df0ff7c219f87ba06166d7c5d54fcc6706b4da7b6d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C8 12048 bytes

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