Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e4b13ef1ed8790…

MALICIOUS

PDF

80.0 KB Created: 2021-03-20 03:58:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d0f2c440e659fe04e0a1b2e1d5ee68b1 SHA-1: 1b5a93bbbf2c65a9eeffe46e528c7409f82c2a44 SHA-256: 91e4b13ef1ed8790b1c508de557a6e4af552dde9d0d13811b8d600c50e9663d0
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://jottigo.ru/123?utm_term=millionaire+game+answers PDF link annotation
    • http://bionatur.space/42088984922p5e92.pdfIn PDF document text
    • https://vowagogo.weebly.com/uploads/1/3/5/3/135307183/defdf937e9a7210.pdfIn PDF document text
    • https://ronukeva.weebly.com/uploads/1/3/5/3/135385202/f9de20f53f15.pdfIn PDF document text
    • http://sodaapp.pro/bad_public_relations_examples_2019i3r39.pdfIn PDF document text
    • http://rodina38.ru/albany_plan_of_union45n98.pdfIn PDF document text
    • http://50offstore.pro/imaan_beimaan_film_songvwk4a.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/musoxifuvitalo/affirmative_formal_command_jugar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e429a0d-db84-494e-8060-a0eda2e3cca6/philosophy_of_punishment_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec29f597-3870-4c7c-9a3d-0850a467a49d/58290424867.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/vogowuwewijazozazuse.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/26981856388.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/hostess_job_interview_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0204d85-c684-41ec-99a0-93083bb6b3a6/64593470257.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/stalker_shadow_of_chernobyl_cz.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/37078095788.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/50294608045.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/whats_on_the_queso_burger_at_sonic.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/which_is_the_best_mifi_router.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/67044203852.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/the_economist_23_june_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce717303-d69e-400b-ae7c-f83cbc11e53f/bollinger_bands_alert_indicator_mt4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11247466-61e5-4b5d-a4ef-515f3dca924c/vebesuxuj.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_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 5100 bytes
SHA-256: 73cf7cfb1481145bcd3c01def1c51a0ac9317af2023b0efb2100aa11f3519133
font_01_sfnt_off00010a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A26 11472 bytes
SHA-256: 7cae194c29427b99299ca4fe46b48eb1e6a95d67121019bf14c311ff046577bf

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