Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fec954669e5ca2…

MALICIOUS

PDF

81.9 KB Created: 2021-04-06 07:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2002e9c4ae09d4bae9a60e72e9512875 SHA-1: 77cd6e5af115ce698cff78c8fd24f5bcefc1c1e7 SHA-256: f3fec954669e5ca2993b61515a27f9e587c0768b62c6817dc4be8d4bdd88bc74
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirectors and a medium finding for being a link farm on disposable hosting. The embedded links, such as 'https://yafferge.ru/strik?utm_term=is+all+the+bright+places+book+appropriate', are designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to deliver a malicious payload or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=is+all+the+bright+places+book+appropriate In PDF document text
    • https://cdn.sqhk.co/suwapipejob/jgjcAib/my_talking_tom_download_for_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471686/normal_60003f5f7054d.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/ibDiajb/ngk_movie_songs_ringtones_download_telugu.pdfIn PDF document text
    • http://banujal.iblogger.org/vidmate_new_latest_version_app.pdfIn PDF document text
    • http://reduslim-shop.website/pavanikelacqc6u.pdfIn PDF document text
    • http://komakukamuduwi.iblogger.org/commonly_used_adverbs_in_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489058/normal_5fe4ba555f453.pdfIn PDF document text
    • http://stylecurtains.com/9848817976tmci6.pdfIn PDF document text
    • https://sopaxibifezubin.weebly.com/uploads/1/3/4/6/134608036/1135077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422645/normal_605ffb219da5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529893/normal_6057edf632955.pdfIn PDF document text
    • https://zesijedoroge.weebly.com/uploads/1/3/4/3/134372038/zarigurafaj-rorolarumaji-zerumuxavonakil.pdfIn PDF document text
    • http://azalea.store/kinulotojojixeo7d.pdfIn PDF document text
    • http://cenderaoriginator.com/how_much_was_2500_pounds_worth_in_19605ffg8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455376/normal_6004fbb3a005b.pdfIn PDF document text
    • https://bolowotusupiwam.weebly.com/uploads/1/3/5/3/135300352/647561249150f.pdfIn PDF document text
    • http://sesapoleva.22web.org/example_of_a_school_psychological_report.pdfIn PDF document text
    • http://usmileofficial.site/tatokedunaamb9.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
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_fbbb95c4e7f3422db87132a8b4d61f20.pdf?index=trueIn PDF document text
    • http://mebufid.rf.gd/machine_learning_stock_market.pdfIn PDF document text
    • http://lopusenegi.epizy.com/this_is_water_what_i_want_is_the_ocean_quote.pdfIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_90e7aaa0eb0e4092881989229bbe75d1.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_913e1b1d3752458a97dfdd6e5bff78b8.pdf?index=trueIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_5a72c43f1dd8414cb7be73b24def4530.pdf?index=trueIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_ae623daac11d4f63ae1ab60fe1be8ec1.pdf?index=trueIn 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_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 5016 bytes
SHA-256: afa27a603127d51a0f876be915ef6064b88ad2baaf360820172b78aeb265731e
font_01_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 11380 bytes
SHA-256: 4e7d3528824d7bc8f540396fb71dd7352ef50cdbdf78693be45f5e17847b9769
font_02_sfnt_off00012bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB8 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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