Malicious PDF — malware analysis report

Static analysis result for SHA-256 0320418681e8cbf1…

MALICIOUS

PDF

63.4 KB Created: 2020-12-02 01:13:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: eba3b46019340e8f1a2792311a2e860f SHA-1: d7a30f1609586d57c2e9052109c5c560fb3d0814 SHA-256: 0320418681e8cbf1d8eee519ccd8a3c03d33efc6d62678d7003b8d8ed56d6a1e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffset.ru/strik?utm_term=ccna+routing+and+switching+lab+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393625/normal_5fbd7ff65fa96.pdfIn PDF document text
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/e47363114b9725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413703/normal_5fb31f068f0b4.pdfIn PDF document text
    • https://nulosogitizibe.weebly.com/uploads/1/3/4/3/134317173/xinojiwefavi_nesiziwogixos_vidavagigapiwad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vutame/compound_interest_practice_problems_with_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0cc92c6de34c7a3aea6f/1606225098563/jamozusini.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/epistaxis_guidelines_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cbc2e19-0d0e-48f8-92cf-6b4e3b5882fd/wortenia_senki_light_novel.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/teoria_da_biogenese_e_abiogenese.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2f9c4116eb00e3c598670/t/5fc4ee8df3de5e49b5fff96a/1606741646502/osrs_f2p_chocolate_dust.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/chemguide_h_nmr_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef8de572-3d7e-477f-94aa-677ffdfcc79c/38173384248.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/libegusufagaguvazowasa.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_off0000b7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FB 5708 bytes
SHA-256: 010c649035aab123eeada1ec3b34e317dce924e9e224a05bd01d4be1f470fc6c
font_01_sfnt_off0000cb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB41 10460 bytes
SHA-256: 256436a2103650e08a412e2fd60b2ba5d8e946d0dd6535fb70ce074a13922a5f

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