Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca6ae8e4c5edf80…

MALICIOUS

PDF

81.7 KB Created: 2021-03-09 10:36:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1e77df782987b2dc4f1282f5cf374be SHA-1: d7730b8146d7299b44df5615b1d139dde9b35327 SHA-256: cca6ae8e4c5edf80f6e4966275b901b214ba3a7c1e24b8959e5dae1a6c590336
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains external links, including a link farm. The primary malicious URL, 'https://soxebez.ru/award?keyword=nationalist+historiography+in+africa+pdf', suggests a phishing or content-luring attempt. Although no scripts were explicitly extracted, the PDF structure and the presence of external links point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=nationalist+historiography+in+africa+pdf
    • https://cdn-cms.f-static.net/uploads/4473963/normal_6021a39e5460a.pdf
    • http://megesodore.iblogger.org/33541798154.pdf
    • https://cdn.sqhk.co/lokutibu/79NzCoV/gevoriji.pdf
    • https://cdn.sqhk.co/vutowogipu/gjghFCq/73810637626.pdf
    • http://tivepijezar.22web.org/british_comedy_guide.pdf
    • https://static.s123-cdn-static.com/uploads/4474739/normal_5ffa77e240b5f.pdf
    • https://static.s123-cdn-static.com/uploads/4491969/normal_6001bfac417d5.pdf
    • http://lozelenirulotu.22web.org/diarrhea_guidelines.pdf
    • https://cdn.sqhk.co/sevimifogu/agg2ggM/pefokazixutov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_ede5ab4361e341e88070e75e5772e8e1.pdf?index=true
    • http://wepilujal.rf.gd/consonants_and_vowels_worksheets.pdf
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_8588628660f643afbdb75f7fd639a43e.pdf?index=true
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_0ccf914c309b476cbb6c0f44b6741ed1.pdf?index=true
    • http://muxofitum.rf.gd/pradhan_mantri_awas_yojana_application_form_2019.pdf
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_05b482f560bb49a6934faf09a21f2b59.pdf?index=true
    • http://zitejilid.epizy.com/scroll_template_tes.pdf
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_2da5c67803614bca8d5ef51539f50b4d.pdf?index=true
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_d26bc8bb3fb44a27b73e04f50460bee2.pdf?index=true
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_32a675732b84402f94c64d530b63971e.pdf?index=true
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_36af0973d03444b28e695cff8026ec22.pdf?index=true
    • http://zikorizerijegiv.rf.gd/zegumaj.pdf
    • 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_off00010269.bin
290e0281b0b9ed9039c3eb2566981c06a17776623e001fd4a598d75c3207a31c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 5488 bytes
font_01_sfnt_off0001151c.bin
15939ae4e5fb0a3ca4e61ce0494c441d242f04d3e9ba7d76c1ad69369911dcd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1151C 10496 bytes

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