Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d85d9d618f9e093…

MALICIOUS

PDF

84.5 KB Created: 2021-03-15 06:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 89b8ee740fa89b101f9da9982f9384ad SHA-1: 02ec20aff913329c4b29db5a4a5717a8433e5fe5 SHA-256: 8d85d9d618f9e0934b6ec221c2e7fe74545fd735d60fd61560621c7302f4eeac
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains or potentially malicious content, indicating a link farm designed to lure users to external sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

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 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://crophysi.ru/123?utm_term=android+phones+2019+reviews PDF link annotation
    • http://umdtheatre.ru/input_type_file_not_working_in_android_cordova503ne.pdfIn PDF document text
    • http://copyrightram.net/338734671892fscp.pdfIn PDF document text
    • http://betmoy57.com/tazonamuk142gc.pdfIn PDF document text
    • http://znasila.ru/how_to_write_a_thank_you_letter_to_a_board_member20xnu.pdfIn PDF document text
    • http://takavejesutep.iblogger.org/vijaleradepolubekefose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413109/normal_5fd3a61a84b99.pdfIn PDF document text
    • http://construt.site/1996_toyota_t100_manual_transmission80uks.pdfIn PDF document text
    • http://fringigejy.site/iata_dangerous_goods_regulationsv5qon.pdfIn PDF document text
    • http://uabiomanix.xyz/havoc_brothers_tamil_album_song_audioox7h4.pdfIn PDF document text
    • http://gunurovidoz.iblogger.org/74276689631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_6017486416bb0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nalosig.rf.gd/is-_453_test_answers.pdfIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_5b8309fc54714857bbf0bb71664317da.pdf?index=trueIn PDF document text
    • http://lutuxulumoxi.rf.gd/universal_vpn_app_apk.pdfIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_b4989433ac49485aa89b2677558c75a7.pdf?index=trueIn PDF document text
    • http://lerezivopo.rf.gd/media_clip_pro_video_er.pdfIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_e392a8b0b7664e6297a30eb1b74bff0d.pdf?index=trueIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_ac64b918bb3b45fbb1c73cca932a2116.pdf?index=trueIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_a310138eb58341b084d824edb9a91198.pdf?index=trueIn PDF document text
    • http://kobukapun.epizy.com/91294008145.pdfIn PDF document text
    • http://pikelimo.rf.gd/pdf_market_leader_business_english_course_book.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_off00010bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 5428 bytes
SHA-256: d6a762e51672e659b5abc3d3bf0dc37ef0f76f83e579969fd3c1593a697fae90
font_01_sfnt_off00011e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E59 11324 bytes
SHA-256: 045b8967ff8cdaaa8e06d1d403c791367c04e9d19b19cb236efda8c8cb6a2416

Open this report in the interactive analyzer, or submit your own file for analysis.