Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f2a5ba41323d9d8…

MALICIOUS

PDF

78.6 KB Created: 2021-04-18 02:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7755a914eb9c7188125458ebd782d712 SHA-1: 7b4ccee7de5bd4553007e7acda56bc1655ebc337 SHA-256: 2f2a5ba41323d9d8f0344632243d2ddec24a6a2f2c305c63925c567f04dc9cf1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or phishing for credentials. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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
  • 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://nipisod.ru/strik?utm_term=bushnell+neo+ion+gps+watch+charger
    • http://fumuroruzej.medianewsonline.com/lutip.pdf
    • https://cdn.sqhk.co/zujubokave/1kIidhi/92638530609.pdf
    • http://fevofawemuwa.medianewsonline.com/vidajofurubamamafulasaf.pdf
    • https://cdn.sqhk.co/zirigajer/hapia35/dead_slow_ahead_meaning.pdf
    • https://cdn.sqhk.co/ponesigis/54WDhb8/42378929357.pdf
    • http://kimujedat.mygamesonline.org/sebokojuwoz.pdf
    • http://sumodena.getenjoyment.net/40936890018.pdf
    • https://cdn.sqhk.co/xivovido/Hjchfj2/4341135770.pdf
    • https://cdn.sqhk.co/gotakavapu/iAejdic/today_s_date_and_time_in_spanish.pdf
    • http://vurejowug.mypressonline.com/pisefosavenapinexujova.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dasobiviwadodaj.atwebpages.com/nokevi.pdf
    • http://wavexijazibivat.myartsonline.com/a_dozen_a_day_preparatory_book.pdf
    • http://vekabun.myartsonline.com/tetuwab.pdf
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_6e21ded13eb44e7c94cabd28fdf3acff.pdf?index=true
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_9c1b976bf59a4571a51f030d01ac4336.pdf?index=true
    • https://s3.amazonaws.com/pidufozu/cual_es_la_estructura_del_texto_narrativo_wikipedia.pdf
    • http://rolubumemetujin.atwebpages.com/ethical_considerations_in_conducting_research.pdf
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_d34bc143682148d598e7b73475b8f753.pdf?index=true
    • https://s3.amazonaws.com/begijufadi/kuzuvusasoge.pdf
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_30e0c98cc8ff408b88a1a425eb123d82.pdf?index=true
    • https://s3.amazonaws.com/nelizenejakarug/76129863283.pdf
    • http://tibutariwu.myartsonline.com/98404408171.pdf
    • https://s3.amazonaws.com/gazijewevan/39117647898.pdf
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_e970f9b334bb4544b269c3325aa70851.pdf?index=true
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_28887aedf0164f1b9f4e8d7d4093eabb.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f368.bin
734a87836192ec1b73005c42634cc0189bda412c8b76f07cf02325f46bfe92c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 5336 bytes
font_01_sfnt_off000105a1.bin
9ca1f7c7246c02c9bd830fcc3988d2787fb062d305959161c763e8360a78fa0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 11428 bytes

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