Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b631b385e648d4a…

MALICIOUS

PDF

78.7 KB Created: 2021-03-18 11:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 918081ccc5ebae7b44a1c5210fadc6eb SHA-1: 5eaf43773a6c7962cb17359f632a73b2c96ac86e SHA-256: 2b631b385e648d4a092cf182dee40ad1b76bd31d4fe54b3530876134e6d4c1fa
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with several pointing to disposable hosting and suspicious domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains keywords related to 'computer literacy skills pdf' and metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/award?keyword=computer+literacy+skills+pdf PDF link annotation
    • https://cdn.sqhk.co/vozaxodep/eVngiez/83724578542.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/GhgbZjc/23111316699.pdfIn PDF document text
    • http://zutelotojenexop.getenjoyment.net/auto_mechanics_textbook.pdfIn PDF document text
    • https://rewusimivizegan.weebly.com/uploads/1/3/4/5/134578415/4702c.pdfIn PDF document text
    • https://povoxiguda.weebly.com/uploads/1/3/4/0/134016665/mivikarejapupeg_busupibodo.pdfIn PDF document text
    • https://fugakesuj.weebly.com/uploads/1/3/0/7/130776648/5821458.pdfIn PDF document text
    • http://gejedesoni.getenjoyment.net/enalapril_davis.pdfIn PDF document text
    • https://cdn.sqhk.co/fusaduxuw/NZWFgcq/bexuvujogodagiwudamaxogi.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/bemewaforupi_duruzefesofuf_wusekiwegosa.pdfIn PDF document text
    • https://bewotababuruga.weebly.com/uploads/1/3/1/1/131163836/manir.pdfIn PDF document text
    • https://cdn.sqhk.co/zeburozupax/5idhc1c/92743010702.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/how_do_preschoolers_learn_to_feed_themselves.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/pexodugosa/93146274232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/873b587d-ae59-4a11-b390-045fea53fed5/17172097146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e839762-9091-419e-988c-8d8d15e66f67/47455066268.pdfIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_5bf265a7c3274568a6f02e522a488417.pdf?index=trueIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_5aacf3bb208f440fbc2bca61c8511e09.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6262c69e-4066-4214-bef2-4150a243a547/83416678427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7212ebe-de3c-450f-83df-19563d1910e3/rorefaxiwugesubezatuxabix.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/puwojolijuvejugefobuj.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/23155625096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bb00568-0ffe-4a97-836e-d5b228e7b831/71274699937.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/vewekosa.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_off0000f48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 5372 bytes
SHA-256: 1477ef010b3c5cb784b361e6d7d838835f6cd5c84f781f31b1842928372c7b0e
font_01_sfnt_off000106bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 11316 bytes
SHA-256: 1df3aa024b854cc3959e9a291537c88570f1fdde309fa01f957b5df01293de11

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