Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54a069abc2d8f45…

MALICIOUS

PDF

75.5 KB Created: 2021-02-26 21:11:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 363b1a1315a89b630f131dde1c3e1131 SHA-1: 8dc22fa191a6a0e915ee198b16ffc8608344701c SHA-256: e54a069abc2d8f456fe2cb43981f9490192cbe1d9378c36cdf899e01abd249cc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/aws?utm_term=how+to+tighten+a+poulan+pro+chainsaw+chain PDF link annotation
    • https://cdn.sqhk.co/lakuxezaj/avhaiba/gijomabopavagonuzudu.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/fRY36OY/91361748732.pdfIn PDF document text
    • http://barekokodigak.iblogger.org/adobe_printer_free.pdfIn PDF document text
    • https://cdn.sqhk.co/fitodofafe/oheidXc/gevadukizevuja.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/h0ijtbt/zig_zag_pattern_carpet.pdfIn PDF document text
    • http://bemigovoso.iblogger.org/gobezofok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459320/normal_6015557b570df.pdfIn PDF document text
    • https://cdn.sqhk.co/totudavomud/YaPBt3t/gomilekamupuzorevinoladaz.pdfIn PDF document text
    • http://prequester.online/ielts_general_writing_task_1_structureqptjz.pdfIn PDF document text
    • http://idealica-italiaofficial.site/pujibibaxoretozama18kmn.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/7qgcIHy/76127930928.pdfIn PDF document text
    • http://baby-slings.ru/sony_dream_machine_icf-c218_display_brightnessu8h4h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484835/normal_6037a9fce0a67.pdfIn PDF document text
    • http://gratoramaa.space/hunger_games_book_vs_movie_compare_and_contrastqwvxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lumuwejonalar.epizy.com/little_nightmares_android.pdfIn PDF document text
    • http://nizegabimuremiv.rf.gd/36175364815.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/what_does_borges_mean.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_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 5132 bytes
SHA-256: c6c8303817a6f182e7d73d5a7967e83d74686e33905b77c94cf03e1b8dd1c033
font_01_sfnt_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 10476 bytes
SHA-256: dfaf629a28289ea82a703c28005225415696df6aa6dfe3e12b66d5b749f065c2
font_02_sfnt_off00011237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11237 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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