Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee3f592a33e0f2b…

MALICIOUS

PDF

70.3 KB Created: 2020-11-26 23:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75e5f7738611d29692200d4b92d6e327 SHA-1: d3497883398658b399c7fe72588935d9eeff6951 SHA-256: 8ee3f592a33e0f2bd1703cf92129de32db7b793e121a20768358c727030a10c0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://trafffe.ru/aws?utm_term=alimentacion+alcalina+pdf', which is likely part of a link farm or phishing operation. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/aws?utm_term=alimentacion+alcalina+pdf
    • https://muwigoxafom.weebly.com/uploads/1/3/4/8/134869335/malanemeguwejizadi.pdf
    • https://jobubati.weebly.com/uploads/1/3/1/4/131453688/nabototubol.pdf
    • https://cdn-cms.f-static.net/uploads/4368265/normal_5f8b2cc027ac1.pdf
    • https://wurumoziwozosib.weebly.com/uploads/1/3/4/6/134644160/nudirasamumovob_bufeseteset_xisuvi.pdf
    • https://zizonilorixu.weebly.com/uploads/1/3/4/7/134772478/diwosalolig.pdf
    • https://xalusadi.weebly.com/uploads/1/3/4/5/134595224/d80e444219182f.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/dudejodeguladu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0e06f19b-3313-4a2e-9930-a02e402e8bf3/gta_5_apk_mod_pc.pdf
    • https://uploads.strikinglycdn.com/files/6260c29f-add5-489a-a0bb-9cf5c42d1fa2/jugebujajerodukudemufope.pdf
    • https://s3.amazonaws.com/ravuxudibure/wolfcraft_router_table_540_manual.pdf
    • https://uploads.strikinglycdn.com/files/a1519f73-2a04-4449-a125-84a0ae8c73ab/18848879489.pdf
    • https://s3.amazonaws.com/wotodedaruzuk/upsc_calendar_2019_download_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/f487c230-5323-490f-afe4-72d2e01cad9d/88224065617.pdf
    • https://uploads.strikinglycdn.com/files/4aade5f8-e788-41db-81fe-4434c18b108b/37366945095.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d739.bin
6b08b42279fa2bfc0ad5a71a80b984345d5a817bef463c64977c07de5228f468
pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 5016 bytes
font_01_sfnt_off0000e83f.bin
6c1b0159639b5a92e634c17d14512b6c2776ffe12f05bdcda6765627b4f9dfc6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE83F 10708 bytes