Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac7a63c7f32d8d8…

MALICIOUS

PDF

87.5 KB Created: 2020-12-11 07:18:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4b756ba491a7442f79259ae943bd7da7 SHA-1: 75381db1bc7fbb35c74f85614033eb14b9eef626 SHA-256: cac7a63c7f32d8d8ff9931fa54e36d0d55b0012271016702f5dec876559cf56e
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or SEO spam campaign, leveraging external links to obscure content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one pointing to 'https://trafftec.ru/aws?utm_term=uc+berkeley+mba+employment+report'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/aws?utm_term=uc+berkeley+mba+employment+report PDF link annotation
    • https://jimagofer.weebly.com/uploads/1/3/0/8/130813953/jiladux-fatowoxev-lebamomumarim-piwifakixem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/60343f76-ba9d-46bc-b206-978f439210c4/kezololupitugiju.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/riwututedu.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/96661105010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6567f373-b299-44c2-8d6c-6f89c3937a9a/cuadro_comparativo_en_blanco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5558d863-b4f7-4a62-9e54-5f40b352d104/25772224919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6041550c-bf28-4a70-897e-070cfa6c8c01/jutejigaxogeg.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/xeduzelutabubot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a437912-f8bd-4e79-bbb1-0e8b48cf0791/daisy_powerline_822_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e67b5ecb-2dd3-4411-8545-6c4ac4828458/monster_manual_update_version.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/dolosorewuxekosuw.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/asterisk_raspberry_pi.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/biblia_catolica_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/39415461488.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 20700 bytes
SHA-256: 1c77193fa5ecb020a81b1263c1efba99e7cd9f302ecac211e628bf3da7687171
font_01_sfnt_off00011915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11915 5196 bytes
SHA-256: 632c4218062a37f9eb455e8ac868e482bbbdec06abe1faeaa17d71306ba8a620
font_02_sfnt_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 11196 bytes
SHA-256: 1d3faffd53c4e67742662aa091dd4ac32eb431bbdbaf867ee722ca64311cfc92

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