Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6d3ed4fc5b1317…

MALICIOUS

PDF

76.3 KB Created: 2021-03-24 11:39:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 30fddefd6e1d028a66fdd2ad9a7eb2d2 SHA-1: c06775df7679e56166cd0755115fe3b82b540578 SHA-256: dd6d3ed4fc5b1317a6014e02be0d51ea3c4d455ac7bef2c7ed4646c2bf5d42e9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous embedded URLs, with one specifically identified as an external URI pointing to 'https://pelibifir.ru/wix?keyword=peanut+butter+and+jelly+costume+ideas'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests the document's purpose is to act as a link farm on disposable hosting, likely to redirect users to malicious sites. No scripts were extracted from this sample.

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://pelibifir.ru/wix?keyword=peanut+butter+and+jelly+costume+ideas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413008/normal_6028172959f92.pdfIn PDF document text
    • https://cdn.sqhk.co/lukumuzu/Qhhbmhf/wabedita.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/hhihidc/jikoluvipadiganagepov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_601df5e77590c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485799/normal_5ffec4d697a1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465924/normal_60580ebbb57b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408174/normal_602ad54d994f1.pdfIn PDF document text
    • http://shoppingyxplus.xyz/jivaxufirevumuf3e4k.pdfIn PDF document text
    • https://cdn.sqhk.co/kezavefizi/OijjdcO/appraisal_performance_indicators.pdfIn PDF document text
    • https://cdn.sqhk.co/lunexubafexo/ggjPbjj/homeschool_classes_palm_beach_county.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379612/normal_6003b00b01c28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5fd0c0b826288.pdfIn PDF document text
    • http://thecet.xyz/73156924687efmbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449421/normal_604e6b64e01d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wurunepoxu.rf.gd/causal_and_noncausal_system_in_z_transform.pdfIn PDF document text
    • http://mujujilunel.epizy.com/download_the_revenant_full_movie_in_hindi_480p_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/80510515668.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/49663993887.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/88463816896.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/aluminium_window_frame_sizes.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/2008_bmw_x5_4._8i_owners_manual.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_off0000eac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 5404 bytes
SHA-256: 46ff5a43c7646f1e1e32f369c3480a92a813424c5fa555d280aa7620cdc8b397
font_01_sfnt_off0000fd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD17 11348 bytes
SHA-256: 73a426269890788a89528c93fb3a312457fdab0cf160c863950eb6957cb0da40

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