Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a590e3294bd7f5…

MALICIOUS

PDF

74.5 KB Created: 2021-03-28 17:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7c3a5fc9975be2edee341841648be66a SHA-1: d4a4f535f1d723a1ca3abdd5a3099c24a9f7035e SHA-256: 27a590e3294bd7f57541fef968118fa4d4cd77d9c05802082a824f87af56f628
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ML classifiers and ClamAV, as malicious and phishing-related. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting an attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a strategy to obscure the true malicious destination through a chain of redirects.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=happiest+toddler+on+the+block+pdf PDF link annotation
    • http://usesoda.pro/74140312068857ex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_603e728569fab.pdfIn PDF document text
    • http://gozaped.iblogger.org/cauda_equina_syndrome.pdfIn PDF document text
    • http://world-wild-shop.com/how_do_you_crochet_a_beanie_hat_for_beginnerskcwu1.pdfIn PDF document text
    • http://chambreop.xyz/34101927735fxv1z.pdfIn PDF document text
    • https://cdn.sqhk.co/faxonudogot/jfhhjgb/punca_autisme.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/hjghGlI/photo_video_maker_slideshow_with_music_editor.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/out_stealing_horses_full_bookdpnqz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371807/normal_600cd09ea34bc.pdfIn PDF document text
    • http://mini-cam2.club/fefitukidobivfuc.pdfIn PDF document text
    • http://lunesygets.xyz/73733171030euewq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425924/normal_5ff90c885eb63.pdfIn PDF document text
    • http://jadebey-x.com/xedujobasaxugilabedejawuv7ky6.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/zopelodu7wq8o.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/47bca6c4-98e1-47d6-a2d9-b9b52cb4ac17/rozipugib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea1a69c0-6d85-4a36-8c2e-e29f41aa6823/81228706150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6bca81-f4b4-4852-9e1c-0b1b6207ac4a/fitawimodimileronuketi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/067e6bdc-9d6e-4402-a43c-a9990cc5bb75/club_c_cardi_sneakers.pdfIn PDF document text
    • http://zivositad.rf.gd/14654005139.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_off0000e50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 5408 bytes
SHA-256: e7f650baa0269a85c3d9b63ee7e72a27e68c357b192f6730ebda125d91385f5b
font_01_sfnt_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 11276 bytes
SHA-256: 9122b537820548ce635a169b9124abb7c56672edf6050376e41660c4eb01cbdb

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