Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4125467a30a4e1…

MALICIOUS

PDF

122.3 KB Created: 2021-04-18 19:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 587daa0f74253f8d2b2cd1c5e728b21b SHA-1: 12c1d2a932bc4e86d597c1590d1b1984c9fdd046 SHA-256: 0f4125467a30a4e1dc59ea0a52963a3fe95cfca6f808bcbcd8107d9e6c02c214
156 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 0.9990

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 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.
  • 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://kuzutuzo.ru/strik?utm_term=how+to+put+comma+in+casio+calculator+fx-991es+plus PDF link annotation
    • http://losabaletolo.22web.org/cerebral_palsy_physiotherapy_assessment_form.pdfIn PDF document text
    • http://vifofumimugeke.22web.org/kowavigevonexaji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mukutud/37668982337.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/how_many_calories_in_an_impossible_whopper_meal.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/88884742305.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/zavigupeworinuxe.pdfIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_35b363a3c0804a12b72289076a3418b2.pdf?index=trueIn PDF document text
    • http://tomosuromiv.epizy.com/gonisuliri.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/kigaxa.pdfIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_4031155f213b4c339fa5de5ffb16f05e.pdf?index=trueIn PDF document text
    • http://mivezemobopu.rf.gd/47934802453.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/pugodogibis.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/3310045090.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e09229ca-b26b-4976-9898-60258a56e6b9/92685497600.pdfIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_f8c3f267cb3a41c9a386ca2fa4718f01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dadupawo/california_acknowledgement_form_2019.pdfIn PDF document text
    • http://saziwujezad.epizy.com/accommodation_form_student_information_ielts_listening_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/tippmann_a5_16_sniper_barrel.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/gesesopenotewofuwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb37c4b-3cfb-4d36-8c47-b04fff535441/wofikobopazapexaj.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/lorutibepa.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/free_android_mobile_spy_software.pdfIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_79db03633451458494c124ed8301a0bc.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000190a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190A6 5520 bytes
SHA-256: 53b6ba0aff57d9167dd229922c680a303b02962f7f4900774c19aa3295d84dda
font_01_sfnt_off0001a36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A36A 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0001abf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABF8 14116 bytes
SHA-256: c8b50fe90df4b226b1299c1e711da67c16821c636dd3f765d0721f5d44b7aecc

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