Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28a4a44103d95e7…

MALICIOUS

PDF

68.6 KB Created: 2021-03-28 05:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1fc2801eaf9fe84746209ddf626bcdc0 SHA-1: 52fb80c7f18fdb6f8ad402a4918f9eefe615d2aa SHA-256: c28a4a44103d95e7a0f2213a899774ab9bbd48c8006a79897d52edbb53ff8c3d
186 Risk Score

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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/wix?keyword=tiny+tanks+unblocked+miniclip PDF link annotation
    • https://cdn.sqhk.co/gisanewat/ijBhdia/75350123186.pdfIn PDF document text
    • http://tadosuzewamu.medianewsonline.com/52967926567.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/jejecPM/forklift_daily_checklist_form.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/5dhjKJP/baxubominaze.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/miejd52/gudusisenarebe.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/chgHtCf/werixoluparenalirilu.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/LjdjctX/nerdy_nummies_galaxy_mirror_cake_recipe.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/solidworks_cam_2020_tutorial.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/40413532762.pdfIn PDF document text
    • https://cdn.sqhk.co/giboxikewev/hciegcu/88016336496.pdfIn PDF document text
    • https://cdn.sqhk.co/rixosadiv/kWmgctK/45315515666.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/mekewufi/sjhifCu/best_hd_wallpapers_for_pc_free.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/gasodamuza/android_adb_logcat_filter_by_application.pdfIn PDF document text
    • http://koradanizepagow.myartsonline.com/defelefexufixelaromavuve.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_994edfefe071476f855d6331a315afaf.pdf?index=trueIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_a271f5c445054bb99e847b1a376a7ebf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/15257411056.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/battlegrounds_free_game.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_1f1fa52364e345ca9bf002826b2543f2.pdf?index=trueIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_e1bd37be29dc4e4887ff78f8a23ab046.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_off0000d0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D0 5380 bytes
SHA-256: 4a5a065e4ae44a763a322b7075ebe916b4ae5f7881c3866cca6b1de0722b3213
font_01_sfnt_off0000e30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30F 9916 bytes
SHA-256: 6f66dff1a52fdc2e7539112edbcdb84cbe221226a6df32434378c5f320be9db6

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