Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc09d55a61de2796…

MALICIOUS

PDF

76.5 KB Created: 2021-02-14 18:33:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 493b46cfd8a4546d7c2e3f753478398d SHA-1: aeb241f3d24942ce8bd0b589540f63ed4c50bbc9 SHA-256: cc09d55a61de2796087a39fbac9fd2f6e53a5eb1b4816737d0e36c86356d5ae3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links pointing to disposable domains and file-sharing services, indicative of a link farm or SEO manipulation scheme. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/wix?keyword=blue+strawberry+cedar+rapids PDF link annotation
    • http://sun-italy.space/accelerated_stability_studylmixi.pdfIn PDF document text
    • https://kajovagej.weebly.com/uploads/1/3/4/7/134747054/dubopexebogefire.pdfIn PDF document text
    • http://autobuff.xyz/anova_estatisticag7lwd.pdfIn PDF document text
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/2650511.pdfIn PDF document text
    • http://wrinklestiltskin.com/76811823659k1u5w.pdfIn PDF document text
    • https://kemavejikokawi.weebly.com/uploads/1/3/2/3/132303077/9218baacad94.pdfIn PDF document text
    • https://babuluvenan.weebly.com/uploads/1/3/0/7/130739113/594e1.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/woronidademom.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/2iffuhb/pokemon_go_type_effectiveness_quiz.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/jfijjaj/hexagon._io_snake_paper_draw_online.pdfIn PDF document text
    • http://lemumelubijene.iblogger.org/2869076567.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/nhf7ngj/agar._io_hack_online_play.pdfIn PDF document text
    • http://tcerkovniekupola.space/linivadekdn006.pdfIn PDF document text
    • https://vaxawoma.weebly.com/uploads/1/3/4/7/134745114/1bdc1e715a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nupejodolet.epizy.com/97013300340.pdfIn PDF document text
    • http://texegap.epizy.com/ms_sql_server_2014_management_studio.pdfIn PDF document text
    • http://pijularof.epizy.com/ap_grama_sachivalayam_anm_hall_ticket.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/lujajimafixitowav.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/1084419391.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 5452 bytes
SHA-256: 94794dc46a15d6623abfb5ddac06ae28fd0dc833d0f0dc80c75a199b3db7475e
font_01_sfnt_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 10176 bytes
SHA-256: b139374f8af05855672d92babe3500dd0dcb6ba7ac6cac5a89cb6205028fff4a

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