Malicious PDF — malware analysis report

Static analysis result for SHA-256 799d9a62855d0054…

MALICIOUS

PDF

85.4 KB Created: 2021-05-18 05:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0e8ea546cd7011271d6b206a0ba0cf5f SHA-1: cf061b94ed2210be2771e1c377ff9da8bc5b92a2 SHA-256: 799d9a62855d00547763fb7273781ca32039a566e9cf545f50903b874ab9c2ea
126 Risk Score

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 model indicated a high probability of maliciousness. It contains numerous embedded URLs, with one prominent external URI pointing to 'https://midufefew.ru/strik?utm_term=codehs+2.10.4+making+taffy', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a malicious intent through link farming on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=codehs+2.10.4+making+taffy PDF link annotation
    • http://tutafukasit.iblogger.org/zimalekotezun.pdfIn PDF document text
    • http://ximasoj.22web.org/xelelo.pdfIn PDF document text
    • http://salufogi.iblogger.org/68205298608.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406466/normal_5ff6ae5a1a6ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450034/normal_5fcf202e235e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372376/normal_5ff1dc7329247.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cfafb24-cc0b-4078-b5d5-3eb0cc5e5062/what_is_patriotism_in_simple_words.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/laptop_gamingowy_acer_nitro_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38d11a8c-5095-4e03-b95e-4a47423c3089/58812724495.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/self-reliance_meaning_in_english.pdfIn PDF document text
    • http://gobavaduxa.epizy.com/vande_mataram_ringtone_remix.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/gns3_appliance_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0104d8f0-0a31-4235-a48c-84163c17becf/nordictrack_act_commercial_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f7d75a6-d897-48c9-8cd4-f79dd2aebc41/37854987194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b444cb4b-2460-4607-b31d-5987457e12f5/miwat.pdfIn PDF document text
    • http://bikemeno.rf.gd/multivariate_correlation_analysis_example.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/canal_carpien_acupuncture.pdfIn PDF document text
    • http://rimuvuvipimube.epizy.com/allahabad_kondapuram_lo_songs_ing_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/report_viewer_2017_dll.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96b3070e-8582-4d00-b83e-5c887c078cf4/tascam_dr-100_mkii.pdfIn PDF document text
    • http://tukakuze.epizy.com/wesiruxosilolegagal.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 5708 bytes
SHA-256: 313d08de979471bc2e58159d8f372ccd120e19a1c3189573a4ec26122763655c
font_01_sfnt_off00010a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 12092 bytes
SHA-256: c10552f7f66b4543fcaac21e30278d2cbbb2bfe0062558ac36f88831e8c9058e
font_02_sfnt_off000132b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B0 16196 bytes
SHA-256: 8f0e4cc40e189f844ba505870c5743bf61ee9cdf6cb8b14e370866b3c0b868e2

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