Malicious PDF — malware analysis report

Static analysis result for SHA-256 40836c3e405d869b…

MALICIOUS

PDF

72.0 KB Created: 2021-03-19 20:50:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: edccf77c26d0657ac9ed5fbdac5d0fd9 SHA-1: 1672aafddf2862496d271c8f6054d7d8ae37b38e SHA-256: 40836c3e405d869bba74060e3685bc2000684069f8b145dfa722c08eabcae7ca
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-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.
  • 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://dafemum.ru/award?keyword=skf+self+aligning+ball+bearing+catalogue+pdf PDF link annotation
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/5453336.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/85956355739.pdfIn PDF document text
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/5897456.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/53555034050.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/algorithms_and_complexity_book.pdfIn PDF document text
    • https://sudoxelavekif.weebly.com/uploads/1/3/5/3/135305243/mivigufokowul.pdfIn PDF document text
    • https://mijipunipiju.weebly.com/uploads/1/3/1/4/131455283/a711893b3b.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/xologid.pdfIn PDF document text
    • http://pepariravifaza.getenjoyment.net/automation_system_design.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/wunojipu/nemetawunepu.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/ios_app_icon_template_for_affinity_designer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c7267b-24d9-4f31-9cf3-01a2293bf1f7/chakra_books_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/how_to_set_up_weber_rotisserie.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/testing_iphone_battery_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/ruger_sr22_feed_problems.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_ceb8a4510d264f438272888d5b06b309.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/romeo_and_juliet_act_1_scene_2.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/zikidetan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a2f5bd7-eeb9-4094-a163-6068f53fcdb3/casio_g_shock_solar_watch_review.pdfIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_c65439615a8d48e3926703b87c30e4cb.pdf?index=trueIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_9dc907a66f76494bb1bda80208839859.pdf?index=trueIn 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_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 5628 bytes
SHA-256: 80abe7e35f54237d3be15d47aeae404f58679ab7216092941cdb6b338aa216e7
font_01_sfnt_off0000ee19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 10584 bytes
SHA-256: 8d7b7550f4d29a5945f612e40f9b55050acc9d25695bbd089eabe532e562ed05

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