Malicious PDF — malware analysis report

Static analysis result for SHA-256 390cbf777d783ed2…

MALICIOUS

PDF

82.8 KB Created: 2021-03-14 14:02:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9f0e5fa0cf6d5e55a5338854b1d60b4 SHA-1: 714ab6d5f7886ded9d1c0dab9445b3139931ece8 SHA-256: 390cbf777d783ed2bbf73209e417cdfc552a987abb9ef2fa7a59756bec424743
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS firings strongly suggest malicious intent. The embedded URL and the document body, which appears to be a garbled search query, further support the conclusion that this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/strik?utm_term=how+many+calories+in+dunkin+flavor+shots
    • https://bolowotusupiwam.weebly.com/uploads/1/3/5/3/135300352/wezop.pdf
    • https://cdn.sqhk.co/nunepokuwe/Dhjjdjh/boxing_star_cheats_ios_2019.pdf
    • https://cdn.sqhk.co/wagomito/O2Y6jcY/jiruzusezuvobujitofavo.pdf
    • https://wikagigodoxuf.weebly.com/uploads/1/3/2/8/132814929/gujin_gixidamesa_dasasujegerud.pdf
    • https://xugugizebe.weebly.com/uploads/1/3/1/4/131482894/vulasib.pdf
    • https://cdn.sqhk.co/taxeseta/hdMThcq/girls_x_battle_2_wiki.pdf
    • http://copyrighthelpcentral.com/vawodumanidese158w4.pdf
    • http://rkconstructionsucks.com/91033441869j4x0c.pdf
    • https://bunutawopuzo.weebly.com/uploads/1/3/4/8/134868528/fb403779633.pdf
    • http://xonewidenutubo.iblogger.org/450_ml_a_gramos.pdf
    • http://googsnat.space/unprotect_excel_spreadsheet_greyed_outjlulj.pdf
    • https://cdn.sqhk.co/moserusoba/ia715Mk/allocine_tenet_bande_annonce.pdf
    • https://xuzijobozu.weebly.com/uploads/1/3/1/4/131411245/remanedexoje-sijodupozeroba.pdf
    • https://cdn.sqhk.co/fogunedevare/m8Lsohb/tejakavofuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8f0ce1ae-a4ad-409f-bdfc-fe87e3e08126/napaf.pdf
    • https://s3.amazonaws.com/dutimajizowa/86394653432.pdf
    • https://uploads.strikinglycdn.com/files/93b98b95-5caa-4a5f-9f58-56d610814739/describe_a_lake_river_or_sea_you_have_visited.pdf
    • https://uploads.strikinglycdn.com/files/0ef0ea51-01d6-49ac-96e2-4f3c8a0ada70/girlboss_sophia_amoruso_quotes.pdf
    • https://uploads.strikinglycdn.com/files/0c5e735b-e055-4395-b0b7-9000b687f689/mejavofujiworejibaxexuv.pdf
    • http://mozogovasopuj.epizy.com/responsive_gallery_css_template.pdf
    • http://bemawom.rf.gd/purble_place_online_free_no.pdf
    • https://s3.amazonaws.com/jodabiladezot/zefelitupufifawireza.pdf
    • https://s3.amazonaws.com/muvojugejoxip/therapist_aid_worksheets.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_off0000f4e8.bin
9616ce630922f559f367b4d2f0f3ac04cc0a23aeb0a82d9e6492db5ef9f6ebf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 5424 bytes
font_01_sfnt_off00010731.bin
094d63ca56fe27d5b96a24c029fccedfcd2f1473ae4b5bdd1285b47415df0aae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 11628 bytes
font_02_sfnt_off00012ef5.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF5 4324 bytes

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