Malicious PDF — malware analysis report

Static analysis result for SHA-256 900da4a1592d81dc…

MALICIOUS

PDF

84.3 KB Created: 2021-03-14 21:13:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac18dfba123f28d3edd12c1c1f41fe30 SHA-1: 7dd30ea3d76355a12a9c69a98864da6eeb9db801 SHA-256: 900da4a1592d81dc5654164b7471f3dacca652520f0be44d9a05ac72f335b992
96 Risk Score

Malware Insights

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

The file was detected as malicious by a ClamAV signature and an ML classifier. It contains an embedded URI pointing to 'bologen.ru', which is suspicious. The document body, though heavily obfuscated, contains references to 'Capital one case interview examples' and authoring information suggesting it was generated by wkhtmltopdf, indicating a potential lure for phishing or credential harvesting. No scripts were extracted, but the presence of multiple suspicious URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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://bologen.ru/wix?keyword=capital+one+case+interview+examples
    • http://startask.ru/count_and_noncount_nouns_worksheets_grade_4kpvzr.pdf
    • http://itsamorem.com/besimalafiwufixawozikurigm2n2.pdf
    • https://cdn.sqhk.co/vibisidumes/hdhiOB3/98223510759.pdf
    • http://zagavuxowipoj.22web.org/uniformity_meaning_in_marathi.pdf
    • https://cdn.sqhk.co/mixaluwekitu/albgeDS/notepad_plus_plus_file_compare_plugin.pdf
    • https://disepijov.weebly.com/uploads/1/3/1/4/131438002/c599c97b56d26.pdf
    • http://ladekepevij.mygamesonline.org/bichectomia_procedimiento.pdf
    • https://saduzuwaz.weebly.com/uploads/1/3/4/5/134599146/lefep.pdf
    • https://cdn.sqhk.co/pivugisaxap/idjb6s5/hammer_man_minneapolis.pdf
    • https://cdn.sqhk.co/rivotoxupow/gjeijgh/traffic_tour_mod_apk_download_android_1.pdf
    • https://leditolovon.weebly.com/uploads/1/3/2/6/132682688/59354c9.pdf
    • http://zeropium.com/kipezoturabalapofupegutgeeet.pdf
    • http://milano-moda.space/87168030100dreqc.pdf
    • https://vegonivi.weebly.com/uploads/1/3/5/9/135986737/3328170.pdf
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/mizutuje-maral-funuxige-tomuzi.pdf
    • http://edayafar.xyz/jemuzaxobepataljtfy0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a448dd07-58e6-44a5-8d54-8e47fb615378/36710907828.pdf
    • https://uploads.strikinglycdn.com/files/9e88e1f1-0360-4753-a3c2-21138c62e9d3/die_kleine_raupe_nimmersatt_geschichte.pdf
    • http://kadegezopofog.rf.gd/73439819607.pdf
    • http://palelezugob.onlinewebshop.net/xawoniwoxusurirola.pdf
    • http://vexabimumemig.atwebpages.com/horus_heresy_false_gods_review.pdf
    • http://gaxapasu.rf.gd/35233830991.pdf
    • https://uploads.strikinglycdn.com/files/87478bbe-49b9-4599-8971-acc8b6a0400f/65446519904.pdf
    • https://uploads.strikinglycdn.com/files/8adb0985-666d-4a98-98e1-ebfe26000e31/what_is_compatibility_in_health_information_systems.pdf
    • https://uploads.strikinglycdn.com/files/b292b666-cbf8-4697-baae-872739f89292/72026563041.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001006d.bin
80cb1b130c0d98ef92600f2c6d361539cbf4d5f8252836e2fe214ffb46e480a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 5112 bytes
font_01_sfnt_off000111c8.bin
5392bf8dcde4f8443992bcf290b390112adf238a6b8de742b3e2bbed38c624a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111C8 10472 bytes
font_02_sfnt_off00013556.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13556 4324 bytes

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