Malicious PDF — malware analysis report

Static analysis result for SHA-256 b411c221ceecc5e4…

MALICIOUS

PDF

72.0 KB Created: 2020-11-20 18:06:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f55007ce7b8d087d2bc5477c7701ef16 SHA-1: ba2a2701094ed8352bc45d333de1c1ffdeb4100f SHA-256: b411c221ceecc5e4c664b9b7e65af50347c1a1f4e5005b319bf10fd9064f9bf8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?utm_term=jhoom+barabar+jhoom+movie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415935/normal_5f9b55114f27b.pdfIn PDF document text
    • https://ganusanawopat.weebly.com/uploads/1/3/4/4/134488834/5443681.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/votuweroxigezog/injustice_gods_among_us_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/decanter_collectors_price_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/words_that_start_with_manu.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/22959480549.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/correcting_incorrect_sentences_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/complete_makeup_tutorial_videos.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/red_labrador_retrievers_for_sale_in_michigan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33394b52-6e0c-4ddc-986d-0ccf49dae3c8/dewopula.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/mercedes_sosa_solo_le_pido_a_dios_analisis.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_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 4980 bytes
SHA-256: db3389dcb942999665056597c5c764b74e7712396e98f6ae414aee7cf4df0516
font_01_sfnt_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 11692 bytes
SHA-256: 403710b7220adb6203ee162c22fb68a8bd1fd731560551890cff406ce6bfc043

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