Malicious PDF — malware analysis report

Static analysis result for SHA-256 158ed6569332546a…

MALICIOUS

PDF

81.6 KB Created: 2021-04-26 10:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fcb9ca31eba6feadb6b4bbf1152adf36 SHA-1: 9a498abc1f2d7a91c63f6ef282ca5ecb9529f3b0 SHA-256: 158ed6569332546a3b2acbaa78f014cd3729844ef2d27776ab9abcef5a2a07c1
156 Risk Score

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 0.9998

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://baarspo.ru/strik?utm_term=facts+about+angles+in+parallel+lines PDF link annotation
    • https://kagepumesafoke.weebly.com/uploads/1/3/4/8/134846889/fisibipikaxuf-kiwetisaxureko.pdfIn PDF document text
    • https://tumazalewiguta.weebly.com/uploads/1/3/4/7/134755417/dokizabemoj-nomepobupedi.pdfIn PDF document text
    • https://pexajutamog.weebly.com/uploads/1/3/4/7/134759810/xanazokukekur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pobixedele/lakarezewaj.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/gabriel_s_oboe_guitar_sheet_music.pdfIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_fc844458bef84cd3b95819299f8eba70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/tcs_aptitude_questions_and_answers_indiabix.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/23191082567.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/70448962861.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/proctor_silex_coffee_maker_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/4088840372.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/anticipatory_bail_application_format.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/mandatory_synonyms_informal.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/medasirek.pdfIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_c32f7d2d07fc4a7d8c95f5e4bf400da0.pdf?index=trueIn PDF document text
    • https://ce5d016b-e5fb-4004-af8f-35f61b829e22.filesusr.com/ugd/d7d7f8_6579ff3301a44e11a2f821b8bfc40c41.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jonora/fermentation_pre_lab_answers.pdfIn PDF document text
    • https://ecc4b077-82d2-4cf1-ad45-1e482560a890.filesusr.com/ugd/5d7ac5_a4bb6a5a0e5344f084ae5453af8a730b.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_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 5076 bytes
SHA-256: db1975abf4aac494eb3a78a9459fd021c2e602483188537901041483604ae374
font_01_sfnt_off000105e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 10972 bytes
SHA-256: 2f0d2a2f6a1a39277b9e5452a5f6bd0adec9571dabf8ba1fc6603f52097e4a09
font_02_sfnt_off00012b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B54 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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