Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b26ec7be318246…

MALICIOUS

PDF

76.5 KB Created: 2021-03-30 01:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9140871cc50b84700661adb6259e4460 SHA-1: d2fd94a5f8b2411598e3703b9e37861aebabea45 SHA-256: 51b26ec7be3182463dc39f67ec1e1fa0dcb80710e6b7e0530114d8fc469bc1eb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a PDF link farm. It contains numerous external URIs, with a critical heuristic identifying a mass of external PDF links, suggesting a primary function of redirecting users to other sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/wix?keyword=energy+conservation+worksheet+middle+school
    • https://cdn.sqhk.co/peposusuwi/mjahb6l/32569795391.pdf
    • https://lomapasaxanigef.weebly.com/uploads/1/3/1/1/131164081/motiputelejej.pdf
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/puxovilosem-polidazosisel.pdf
    • https://lutowixo.weebly.com/uploads/1/3/4/7/134705225/soketotitiwafezegin.pdf
    • https://mipapipav.weebly.com/uploads/1/3/4/0/134012398/ledabogizarufuz.pdf
    • https://lobalose.weebly.com/uploads/1/3/6/0/136089755/2298999.pdf
    • http://moxolesapudeli.22web.org/all_in_one_old_games_apk.pdf
    • https://cdn.sqhk.co/gopilufifeda/Dggheic/tibotitujegesuvewubodi.pdf
    • http://nasumowuvajoda.iblogger.org/biology_multiple_choice_questions_download.pdf
    • http://pejibapu.iblogger.org/el_llano_en_llamas_cuentos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://danobefaxejo.rf.gd/lazak.pdf
    • https://s3.amazonaws.com/zarelusipofox/boboiboy_galaxy_theme_song.pdf
    • https://s3.amazonaws.com/luborinizu/93271414201.pdf
    • https://s3.amazonaws.com/fotojipifuzitul/87484878385.pdf
    • https://s3.amazonaws.com/fowikorejodi/agyo_privacy.pdf
    • https://s3.amazonaws.com/pevarijidasalop/wodimenugenuxebuwivoli.pdf
    • http://jekidosokun.epizy.com/emirates_airlines_male_cabin_crew_uniform.pdf
    • https://s3.amazonaws.com/jinabom/32027111971.pdf
    • http://pifajizimaguda.rf.gd/5e_acquisitions_incorporated_download.pdf
    • https://s3.amazonaws.com/varolexexus/65957181437.pdf
    • https://s3.amazonaws.com/dobesogum/dekurikezenikam.pdf
    • http://mogerokefo.epizy.com/69180033880.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_off0000ecdd.bin
baae395fb8379e141b1377359d341d535b78e1230377f35f98ff6af446cfd39d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 5628 bytes
font_01_sfnt_off0000fff7.bin
8ae8b81aa4ab7c913a37d2ffb063901708c4789e7fff7a61c1b266bbb5d83d90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 10580 bytes

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