Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e7c5be25d70bb7c…

MALICIOUS

PDF

83.0 KB Created: 2021-03-24 16:32:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8ee57dab4bc717b4845c6332b62716f3 SHA-1: a6d076d094d07f412ff3308151bf643a0ae20262 SHA-256: 2e7c5be25d70bb7c65cd291211c1eb0b9ac44d684caed3d479bcd78ca03db817
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a spearphishing attachment used to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://soxebez.ru/award?keyword=como+aprender+ingles+guia+definitivo+pdf PDF link annotation
    • https://cdn.sqhk.co/vobipibomuk/dsXmsie/pusipipekulixit.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/ifadMgc/25887071881.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/fVwEieY/mowasafaperikul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380699/normal_5fec3b559c73b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392877/normal_6007bab89ceae.pdfIn PDF document text
    • https://cdn.sqhk.co/niripakexad/hdfjaif/what_is_dyngus.pdfIn PDF document text
    • https://cdn.sqhk.co/wogebebaruro/jaQvIVi/top_2020_country_songs_youtube.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_52713c4e46194b74888a6433db3f5024.pdf?index=trueIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_8253e71a2b324608bcbe63037947a6cf.pdf?index=trueIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_abb4a479bbfb47e6a28c4dd8e8ef2f96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/dewegafebexusujikeluve.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/jofudizomupajo.pdfIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_a0d1bd1d5bb34f59940ca912741b5eae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/21404170871.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/para_que_sirve_jengibre_con_limon_y_miel.pdfIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_1a24e290ec0849cba467eb84127e481b.pdf?index=trueIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_4f591a5136aa4637b57693f58d620187.pdf?index=trueIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_872c65c55b7d413f84e6763bd2c37955.pdf?index=trueIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_03cfa8a9597e4749b2a49e2dc564e656.pdf?index=trueIn PDF document text
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_de5a16b4d9924331baff2e1e672a5287.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
    • 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_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 5324 bytes
SHA-256: ecbbe016958fece0dc7fe03d8617ac33f395cde0d8d8b714b73d8a673d5fd6a2
font_01_sfnt_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 12812 bytes
SHA-256: 97b9ae35e776e18d8e6ce419bc7c366ffef36a5adba8298842dc8a61f15b5470
font_02_sfnt_off00012585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12585 16616 bytes
SHA-256: c6616addabeae9d921989974b174b59b884a6961bc998170a413a164ea99a98e

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