Malicious PDF — malware analysis report

Static analysis result for SHA-256 881932ec8c679c13…

MALICIOUS

PDF

128.9 KB Created: 2021-05-19 16:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cb76db035e59a7ad0d525d1bf0643d52 SHA-1: b7be351e29bd855f11b311732cecbe4cdbc17e1d SHA-256: 881932ec8c679c1397448e5d57aac36241fe5d922cd5a0a29074cb11115d854b
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an external URI and an SEO redirector link pointing to 'https://bologen.ru/strik?utm_term=ielts+speaking+questions+part+1+2+3+pdf', disguised as IELTS speaking questions, indicating a phishing lure. No scripts were extracted, but the PDF structure and heuristics suggest it's designed to deliver a malicious payload.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/strik?utm_term=ielts+speaking+questions+part+1+2+3+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4504788/normal_6040ac7e33958.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393026/normal_5fcd99db781e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415526/normal_602ce5554eb32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410211/normal_601100cc055f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387430/normal_6029eedae0dac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453729/normal_5fd94bcb85806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_6020a88cd11c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413474/normal_601771f7c3d03.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/xesigeze/50981494407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28d59d70-70b2-416c-88ba-9f863e2f3325/signs_and_symbols_of_advent_ks2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb418f59-48f4-4a3c-bb47-24f0df1d5c79/totitemiwuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/bedpan_commando.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a5a2456-3ef8-4cc5-93ee-00af1b5ccf68/acer_aspire_keyboard_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/18405558792.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/pride_and_prejudice_film_watch_online.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/active_learning_template_medication_digoxin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd51cd62-d120-4143-999d-47c2ce2b1101/dafopetofarapovatuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fad6957-c7cd-4c7d-a9a9-3e199f796706/medicina_ancestral_y_epigenetica_florencia_dafne_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94fc86cc-807f-4871-b967-f8b5d4972ff5/10744969797.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/sinulurowoduvamusironow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dfcc2dc-5542-4b9b-8ded-50ce40a005ca/najoxetatalijuza.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/49185477916.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_off0001bb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB64 5684 bytes
SHA-256: 458700e5e94e069b771ec869dcf9234a69699bca563823a40cfc98a27481e439
font_01_sfnt_off0001ced2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CED2 10996 bytes
SHA-256: 76e93a1f3e76058f425e9b50eaf130f3fe5be4f9422ff006e7f8df796eb371ad

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