Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d58bc155c69572e…

MALICIOUS

PDF

68.8 KB Created: 2021-03-24 15:02:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5b575bebaee074388b524d39472158ef SHA-1: f613f3addd33481a8f78bfa5c92876b4e856ec00 SHA-256: 4d58bc155c69572eecfc3be122de726e5964d8814dd69a6c5cb7a1ded684ee60
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=tx500e+thermostat+manual PDF link annotation
    • https://cdn.sqhk.co/pugepavofu/d2SjiUD/vmware_multi_cloud_briefing.pdfIn PDF document text
    • http://pifafixejizigu.scienceontheweb.net/78119437089.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/FPjb3q6/34889951221.pdfIn PDF document text
    • http://frankiearvelo.com/british_council_reading_practicetdr4m.pdfIn PDF document text
    • http://maslovauto.ru/97859047701nolj1.pdfIn PDF document text
    • https://fejunula.weebly.com/uploads/1/3/4/3/134363834/winijufuzegirinile.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/gcthdib/46055700726.pdfIn PDF document text
    • http://jigapenufi.medianewsonline.com/ergonomic_workstation.pdfIn PDF document text
    • https://texatejoluneb.weebly.com/uploads/1/3/5/3/135318687/kavatugug.pdfIn PDF document text
    • http://dizititakozazi.mywebcommunity.org/ramipadadefenure.pdfIn PDF document text
    • http://tofofupetofido.iblogger.org/31801285930.pdfIn PDF document text
    • http://nipamaton.22web.org/naming_acids_and_bases_rules.pdfIn PDF document text
    • http://savadaqwe.space/demonstrative_pronouns_worksheet_spanishfpqjk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/jadiloze.pdfIn PDF document text
    • http://jupunefubepaza.rf.gd/kusugexojibe.pdfIn PDF document text
    • http://tidefos.epizy.com/topical_sermon_outline_template.pdfIn PDF document text
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_5ec3d09a7b374979b1ac39ff8c0b96a1.pdf?index=trueIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_dafab9770322418c949e17e5735a853d.pdf?index=trueIn PDF document text
    • http://vonizevugopu.rf.gd/50261306177.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_3138728b1e9c47a0a8a2b90db76efd78.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB2 5208 bytes
SHA-256: 6d29d206297021c57cb5dc0c00c1cda76e0bae8a80f7fff596e47ff18dca7179
font_01_sfnt_off0000de41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 11308 bytes
SHA-256: 54f176af28a3071f345a247fa2a0463bb8d40e45f4fb9038d5b9ba304f73ded5

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