Malicious PDF — malware analysis report

Static analysis result for SHA-256 077d353953807450…

MALICIOUS

PDF

76.7 KB Created: 2021-02-28 06:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: aaa10c0469ef7cc8f536709c83be06c1 SHA-1: 9fbfba2491335f77ed27c84efe63194a1cccf5e5 SHA-256: 077d3539538074503906c54902a6ee8e8400cf5918a59cd4db45580da695353b
126 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=who+qualifies+as+a+vietnam+era+veteran PDF link annotation
    • http://jonebukusopovet.mygamesonline.org/43529074202.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/explode_the_code_books_1-8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450351/normal_5fff613c64ffc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427268/normal_5fdb80badf6a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492240/normal_5fda8a2607632.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386851/normal_5fdd6554667e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426090/normal_601182023e228.pdfIn PDF document text
    • http://burivuvuju.medianewsonline.com/how_many_books_are_in_the_5_kingdoms_series.pdfIn PDF document text
    • http://mujuwowewo.22web.org/10352324861.pdfIn PDF document text
    • http://waliduv.mypressonline.com/lusomifapitabido.pdfIn PDF document text
    • http://katipef.medianewsonline.com/zesimuvejekedoloz.pdfIn PDF document text
    • http://dikerulaba.22web.org/winomonaxojopesetepaze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://damikofem.rf.gd/cinema_guide_melbourne.pdfIn PDF document text
    • http://jugikan.epizy.com/dagannoth_kings_slayer_guide.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_off0000db53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 5204 bytes
SHA-256: 7934cb01ab5c8c6bdda23ee814e199ff1fbb7d79f44b010889d169d6d179754a
font_01_sfnt_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 10552 bytes
SHA-256: ccbf25d6b3063a7d204dde54458556fddf138558ce7146cba5395c49b2679be7
font_02_sfnt_off000110ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AB 16140 bytes
SHA-256: 3f83bbfb2e03141a9083badfb1da6e2b1773f9aa6b1ed8f30fc2d392a5ee3553

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