Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd183f733d3da340…

MALICIOUS

PDF

80.0 KB Created: 2021-03-16 11:36:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e3a5fc4ee36488ce998103b4965c9b83 SHA-1: b135299438532e03f85cd610af6a7de093f89129 SHA-256: fd183f733d3da340c762423919feff012583f4de8a5de258e2477cb86af458de
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains a large number of external links, many pointing to S3 buckets, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The embedded URL `https://resalured.ru/award?keyword=adosphere+1+pdf+%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C` is particularly suspicious and likely serves as a primary distribution point.

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.
  • 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://resalured.ru/award?keyword=adosphere+1+pdf+%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C PDF link annotation
    • http://jarowulizose.sportsontheweb.net/26192574651.pdfIn PDF document text
    • http://jatamonip.iblogger.org/64864330029.pdfIn PDF document text
    • https://gopogusefivow.weebly.com/uploads/1/3/1/4/131406686/zivofojenipota.pdfIn PDF document text
    • https://mutefalififide.weebly.com/uploads/1/3/1/3/131383766/pusajexedabusosuf.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/advanced_academic_vocabulary_list.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/juduk/cpm_homework_help_integrated_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/83415295660.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/vesig.pdfIn PDF document text
    • http://sabukizazuse.epizy.com/bipinunez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/446e0d96-f089-4dab-82a7-4f320568d290/sintomas_de_trombosis_en_pierna.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/5272160358.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/utilitech_sump_pump_lowes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed636a5f-88aa-4e30-8002-2885a283c0da/what_language_is_the_quran_written_in.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/what_is_sociological_imagination_examples.pdfIn PDF document text
    • http://jalafud.epizy.com/antagonista_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/pesidixonogowa.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/baahubali_2_4k_movie_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/452b48a0-5693-4e76-8bb3-6a9eb4c8c26c/what_legendaries_can_you_get_in_the_ultra_wormhole.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/buscar_un_iphone_desde_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d1c8965-5930-4d61-9457-6de9034fa8fb/computer_science_an_overview_of_computer_science_sherer.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_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 5556 bytes
SHA-256: 14f6be027b7dacf0a4f062cfdf4c5c56d02c0d93f89437bb739bf58b95b99a88
font_01_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 15732 bytes
SHA-256: 0d74e0385bbbe3fbb8bd35784faa77ac0cf5b460a5865411ba4ab720f2336b2b

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