Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ed13cc965076b3…

MALICIOUS

PDF

93.7 KB Created: 2021-03-22 22:21:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3c25125326e1528dd386b60dbab86633 SHA-1: 3d7f06d1d7f9b597d9070b3cd8f55a9a4b28bf47 SHA-256: e7ed13cc965076b34e32966219a7118424acc6128a965e1a8bae95e20cb1bb67
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The primary URL, 'https://resalured.ru/wix?keyword=drift+velocity+equation+a+level+physics', appears to be a lure for educational content, likely to disguise malicious intent. No scripts were extracted, but the structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://resalured.ru/wix?keyword=drift+velocity+equation+a+level+physics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501360/normal_601501afa38d5.pdfIn PDF document text
    • https://vosovijuz.weebly.com/uploads/1/3/0/8/130813614/2e914e2bef3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_603557e52f860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465539/normal_5fd38a58760a4.pdfIn PDF document text
    • https://pejilajapife.weebly.com/uploads/1/3/4/4/134477767/8110817.pdfIn PDF document text
    • https://cdn.sqhk.co/pawosuku/dhasJge/hello_neighbor_hide_and_seek_android_apk_obb.pdfIn PDF document text
    • https://vowagogo.weebly.com/uploads/1/3/5/3/135307183/sowuvetapigunesato.pdfIn PDF document text
    • https://kofivenemiwelew.weebly.com/uploads/1/3/1/3/131380814/xonigepabezu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454819/normal_5fc6dafe2ac90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470391/normal_5fea2d2eea846.pdfIn PDF document text
    • https://dosukasexu.weebly.com/uploads/1/3/1/6/131637789/xipamokekuz.pdfIn PDF document text
    • https://zidajikivumab.weebly.com/uploads/1/3/4/6/134625594/vugan_fuvumomasusijov_xulenazabola_tasiragopid.pdfIn PDF document text
    • https://cdn.sqhk.co/jigijobofofa/aOLU3jf/xofigabobidekid.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/ysrHhd7/11606758672.pdfIn PDF document text
    • https://cdn.sqhk.co/nabotogemobe/XFjfBYR/free_mp3_music_download_sites_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/wW8cjbt/fedoxexotabine.pdfIn PDF document text
    • https://cdn.sqhk.co/miranilu/QBiicXP/sniper_legend_2016_movies.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/iimgj0z/komijesudosig.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/2398609.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_69e1b8d9b3bb48259f073ce58cbb9a55.pdf?index=trueIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_27aa8486df2e4f358d6cd070e4bd93b3.pdf?index=trueIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_b9d1b7b18e3f45d1b8a8d090e00387a9.pdf?index=trueIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_92f0708251f144bc8267ad586de29c57.pdf?index=trueIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_916f9a366bbf41948c8c32ed9e268479.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_off000117d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D2 5388 bytes
SHA-256: 4f8992de0df0e7a61ca7a0dfd30ad49a225ce288c045e32a625927a0dac09774
font_01_sfnt_off00012a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A39 12220 bytes
SHA-256: 20d867656ac12b627567015d30e7a1cd664dcfde9f620addf60597543b650286
font_02_sfnt_off000153a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A0 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727

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