Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7c7f182afea25a…

MALICIOUS

PDF

84.6 KB Created: 2021-04-06 08:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f40bf73599352a59bd7a60bb216a2f59 SHA-1: 95e1deeba70056a9f01d3195a1ba580a469c8395 SHA-256: 9b7c7f182afea25a81be2a00f054db899ba430a8ebb791ea1d3e677be1e9c913
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users to malicious sites. One prominent redirector URL, 'https://jumiwimov.ru/aws?utm_term=martin+seligman+authentic+happiness+amazon', is used in conjunction with a lure related to a popular book. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9468

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jumiwimov.ru/aws?utm_term=martin+seligman+authentic+happiness+amazon PDF link annotation
    • https://bizudabug.weebly.com/uploads/1/3/4/7/134722823/e0dbf9e6734ca.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/bffc4.pdfIn PDF document text
    • https://cdn.sqhk.co/wolanojijen/9kjitig/stickman_run_shadow_adventure_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/joxusozomilo/FOhjVid/subtraction_worksheets_ks2.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/djghapw/bawavotejalid.pdfIn PDF document text
    • https://cdn.sqhk.co/leguzufaju/ghyidDw/20779571172.pdfIn PDF document text
    • https://cdn.sqhk.co/suwojixuwebi/chdihgh/doomer_girl_cosplay.pdfIn PDF document text
    • https://cdn.sqhk.co/guxudakakali/9gcDSmC/banurijutetuwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/88fd4779-0c12-4c7c-8b6f-9c3d2e44e872/dumepofokeridufi.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/low_calorie_coffee_options_at_dunkin_donuts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c45fa64d-50e9-4a92-bfee-f6dbd7848d2d/98070141924.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/forced_convection_heat_transfer_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b6bf0c0-31c1-424b-886f-8283ea1e83b7/dash_diet_2_week_meal_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43c365e6-f45c-44fa-b3dd-cf3a6f9715a9/law_fighting_words_legal.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/veeche_chirugaali_nadugu_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c1f5e9-0913-4cc4-b180-1b55ec6c234a/4108097948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c9be0eb-ccd9-4993-8217-57d4f7148988/wolevubunatibulasazelap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f788f7d-0be7-4dd4-a30b-597d2224d1c5/sentence_construction_worksheets_for_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/wafene.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/mupuk.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001434d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434D 5404 bytes
SHA-256: 16c67deb2b1f34f80edd7d04b6f942d21f5c8ceea6580359198295ef7d6f23ab

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