Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be09d82a17b47f2…

MALICIOUS

PDF

90.8 KB Created: 2021-03-26 14:15:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6eb889df758e5bf402e566e664e8cbd SHA-1: d9d1cbd5b3d5977acda88b9cc03968c12b6b0e4d SHA-256: 4be09d82a17b47f238607fe678dd073dca4ae5dee4113e18a286977ca2c542fc
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with the primary lure being '15 days practice for ielts writing pdf download'. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or phishing attempt. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics confirm the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jacksth.ru/award?keyword=15+days+practice+for+ielts+writing+pdf+download
    • http://apkweb.net/damexiduli5z5t.pdf
    • http://faguduni.22web.org/pobisidewizenowizeveb.pdf
    • http://instgrmmverifiedbadge.com/nikon_p_223_3x9x40_bdcnrg6v.pdf
    • http://flymoney.net/vewamerekezjye.pdf
    • https://fitulepam.weebly.com/uploads/1/3/0/8/130874207/be2288d1f.pdf
    • https://walafikug.weebly.com/uploads/1/3/2/7/132740659/rewimisisuru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vajitefafuxuz.epizy.com/historia_de_los_derechos_humanos_linea_del_tiempo.pdf
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_f0347799ac364b8284ab1f4c778e93f4.pdf?index=true
    • https://s3.amazonaws.com/ratixifo/wenuruzopivo.pdf
    • https://s3.amazonaws.com/wuwabobujasivor/xajarazepa.pdf
    • https://s3.amazonaws.com/jokotaziweluge/gospel_of_thomas_quotes.pdf
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_301e760e9aef4207b3fc11ba2a25a067.pdf?index=true
    • https://s3.amazonaws.com/gogonof/begagajijagaladadulixedul.pdf
    • https://s3.amazonaws.com/sefukirexuwekij/car_games_loading.pdf
    • https://s3.amazonaws.com/negonanopix/a_grammar_of_motives_summary.pdf
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_8eb97501fef94f45916e0c1908204176.pdf?index=true
    • https://s3.amazonaws.com/zoxewudunigus/zusikanumelejogasoxag.pdf
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_df069c2fb65b4555b14086b57bec1412.pdf?index=true
    • https://s3.amazonaws.com/muvazi/samsung_a10e_phone_case_near_me.pdf
    • http://morovewonapulaj.rf.gd/64283846519.pdf
    • https://s3.amazonaws.com/wexoteluwag/tbd_full_form_in_pro_kabaddi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a76.bin
48cd2ccf8786aa18716c9e7923afc2f39e0619b002d65828831227f17c260818		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 3396 bytes
font_01_sfnt_off00011686.bin
0fcc950adb03beb6a9a373db4199d33371fce0978967f5931d8b231acadbfb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11686 5388 bytes
font_02_sfnt_off000128fd.bin
1a6f625d9ea46d934a6dfed8e409d6b8f500de2dc19e3d116c3696bec4931499		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128FD 10616 bytes
font_03_sfnt_off00014d70.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D70 4324 bytes

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