Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfac8917cdc3cdf…

MALICIOUS

PDF

77.7 KB Created: 2021-03-07 20:53:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a5c49f5f33e7338b389cc586e1c584b9 SHA-1: 29a311848b2a5e38e787ecec9b85a16989141e14 SHA-256: dcfac8917cdc3cdf3bdd85cbcf87a2fdb064b56df0078473c0719a45fad09b7b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDFs, suggesting a link farm designed to drive traffic to a malicious URL. The primary malicious URL identified is 'https://jottigo.ru/strik?utm_term=hp+laserjet+p2015+toner+refill', which is likely used for phishing or malware distribution. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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://jottigo.ru/strik?utm_term=hp+laserjet+p2015+toner+refill PDF link annotation
    • http://mijudivoxobo.iblogger.org/two_adjacent_lines_that_rhyme_form_a.pdfIn PDF document text
    • https://xudagemiribu.weebly.com/uploads/1/3/1/3/131378943/81d913a42e.pdfIn PDF document text
    • http://rabejagoruwobol.66ghz.com/activate_microsoft_office_2013_free.pdfIn PDF document text
    • https://xodetawutal.weebly.com/uploads/1/3/0/7/130774968/42e17eb37.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/rexogeguxosix/8552370283.pdfIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_8dfb706ccdef4af2b0d503b841808e2b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/saseniloxegit.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/pc_play_store_windows_version.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/girl_scout_cadette_cybersecurity_badge_requirements.pdfIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_b0ee060b81d6413ba1399777d7783e68.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bodajaku/comparative_and_superlative_adjectives_worksheet_with_pictures.pdfIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_d1ac271a476840be979ec043716208a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e134ca4d-358e-4d36-a553-dfcde8678d24/83530989820.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/gazela_vinho_verde_tech_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c5e64bd-0dc9-4def-83b1-e0a09d1f9c72/niveles_de_lectura_literal_inferencial_analgico_y_critico_valorativo.pdfIn PDF document text
    • http://releboxodaw.rf.gd/gidedodagavizetofuxefiw.pdfIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_e7defa584e1f49a9bcb49f6bfb6e01fe.pdf?index=trueIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_4728876a7df74c378be5f2e29ddb34a0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jinabisura/63218587822.pdfIn 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_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 5380 bytes
SHA-256: 71f091a34dcc8742975bfcaba72d744987113345d6aae6d307a27ac052ee2834
font_01_sfnt_off000104e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E1 10836 bytes
SHA-256: cd16d5387b581e98335b755dae2fff7ca6c4da01e79ba7f125c1685bf80a7ff6

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