Malicious PDF — malware analysis report

Static analysis result for SHA-256 e983ac72e53a2a26…

MALICIOUS

PDF

88.6 KB Created: 2021-03-25 01:39:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 16aca7f6075895b08c9cd211e919d99a SHA-1: 4aec9c5049da434aeb47d27a102258a390c02c5f SHA-256: e983ac72e53a2a26f1fab4b626d952dbb4b2a52c1f0f941d049b6dec21548a8c
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to a 'study guide', aligning with phishing pretexts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/wix?keyword=usps+postal+exam+955+study+guide PDF link annotation
    • https://vuzufakafedovi.weebly.com/uploads/1/3/5/3/135347170/lunefa_kuviz_mazukemuzubi.pdfIn PDF document text
    • https://limisakaxenit.weebly.com/uploads/1/3/4/3/134371081/a39770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452587/normal_601e0fbf3d3b2.pdfIn PDF document text
    • http://lifeit.pro/android_emulator_pc_1gb_ramo02eh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448539/normal_5fe8e623614b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450249/normal_604f41f03176e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387816/normal_601ecc6264dcb.pdfIn PDF document text
    • http://sdl-trade.com/esercizi_di_imperfetto_o_passato_prossimo497oc.pdfIn PDF document text
    • https://lokulubebu.weebly.com/uploads/1/3/1/8/131856352/dedob.pdfIn PDF document text
    • http://apelsins.space/subway_skateboard_onlinesd486.pdfIn PDF document text
    • http://bezprovodov.guru/how_to_draw_books_for_13_year_oldsc53sq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/bodies_that_matter_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/10255229979.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/ironman_smithing_guide_osrs.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/capitalism_lab_cracked.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/smart_goals_worksheet_for_college_students.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/38665397197.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/what_kind_of_battery_does_my_scale_need.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/16_ga_sheet_metal_thickness_in_mm.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/idsa_uti_guidelines_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/how_to_replace_husqvarna_chainsaw_sprocket.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/citrus_rootstock_selection_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/lijimegodalujujibomidemet.pdfIn 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_off000104e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 5624 bytes
SHA-256: 44b62c527b992414fbb5b0588b2e24acd7dd26f3ad20a3a6c2e98519891edc55
font_01_sfnt_off0001180b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180B 11536 bytes
SHA-256: 59877294891d7bdff149b67e1caf564269b189ffa35c3d3cb91c056bb81df036
font_02_sfnt_off00013fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB0 16140 bytes
SHA-256: 3f83bbfb2e03141a9083badfb1da6e2b1773f9aa6b1ed8f30fc2d392a5ee3553

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