Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d891d1b9a3373c9…

MALICIOUS

PDF

86.2 KB Created: 2021-04-24 23:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f3eff14b73977a2fb50144d59493710c SHA-1: d47cd28e07ecc342dfbbb529bfddd1f877e6db65 SHA-256: 1d891d1b9a3373c90df3a5c33cc36f5f137e7266ba369765f65dcb2c511d7f85
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers. It contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is https://golowaki.ru/strik. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/strik?utm_term=the+stranger+book+characters PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371005/normal_5fe2d3c199760.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/limits_fits_and_tolerances_questions_and_answersd920p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450350/normal_601bfc4a384cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_5feaef7205eb7.pdfIn PDF document text
    • http://nashremont.site/bugasagevaddwuj.pdfIn PDF document text
    • http://vvd.bar/bhojpuri_movie_nagina_freegm977.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_615ab9b55a3441caaddc1b615d51ee2c.pdf?index=trueIn PDF document text
    • https://6ae5a9c1-8526-45f7-b068-03ddf2465b28.filesusr.com/ugd/87f732_76723b017ebc4d1c813eb63087d046e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukujidor/rpg_plot_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/crossword_quiz_movies_level_one_answers.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_019646409ce143ca8f533c025973a67d.pdf?index=trueIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_4b107f68af764a4daaf5a0a6a67582f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/can_blockchain_revolutionize_the_supply_chain.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_5db1fe9bf66a43ecad7f03c5dcea59df.pdf?index=trueIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_68c0c5bed83243fba5133a046c7cb06e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/125917290.pdfIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_e32debcca354442180649ca388fbee53.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_359c6ea9e51741f081b82a63aeae462d.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_f680942b416a43b093344a6a12f0ada8.pdf?index=trueIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_26035da943b64c50b887e70c1d7b0ca5.pdf?index=trueIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_14c82dd885ae42e3819d99d9a279e678.pdf?index=trueIn PDF document text
    • https://cc603790-e41b-456e-9848-d053b607cad6.filesusr.com/ugd/389793_c8040ea5fdd840e695439c4a6283f343.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11372 5184 bytes
SHA-256: ad84bacca8f320e18e1971bbf1fcff19ad55b684cdcd1c08471ac3e474c53b8c
font_01_sfnt_off00012511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12511 11260 bytes
SHA-256: 27fd29c742dae6a987dda15f72cbbcf07ef3bb5af6ac67029ed62792c8ba7424

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