Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4fa8a538dd1489…

MALICIOUS

PDF

79.8 KB Created: 2021-04-01 09:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dee35d0eb4bd554a1b24e2e2cc9179e9 SHA-1: acc24a5f651cbf828fe292ee5b6a39801d3d5ca1 SHA-256: 3a4fa8a538dd1489347e2419e8730f3873911ede37296160c487ff82530782dc
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with the primary URL pointing to a suspicious domain. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/award?keyword=lokale+und+temporale+pr%25C3%25A4positionen+%25C3%25BCbungen+pdf
    • https://cdn.sqhk.co/sativomofij/R5jfQnN/ww2_bomber_games_unblocked.pdf
    • http://madalez.22web.org/57204029127.pdf
    • https://cdn.sqhk.co/fokofike/bgi4Ohh/cosmos_neil_degrasse_tyson_2020.pdf
    • https://cdn.sqhk.co/bogofuvizibu/KIij7gd/81243034674.pdf
    • https://cdn.sqhk.co/jipodipotaj/qsawidF/alienware_m17_r3_vs_r2.pdf
    • https://cdn.sqhk.co/navotezive/ulge2ie/ghouls_and_ghosts_mobile_apk.pdf
    • https://cdn.sqhk.co/ruvuwoki/hffGPib/gitogawaj.pdf
    • https://cdn.sqhk.co/tozegatopaxu/whhggF9/android_change_favorite_contacts_widget.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/17e80cb0-c002-4f85-8a15-2279c7ebbb5f/what_jobs_are_in_demand_in_sa.pdf
    • https://uploads.strikinglycdn.com/files/4d217602-0e62-49dc-be06-41dd2e3327b1/netgear_router_wnr3500lv2.pdf
    • http://mevabifutaxepag.epizy.com/learners_licence_test_book.pdf
    • http://bajolufek.rf.gd/4d_anatomy_app_android.pdf
    • http://fiwimawa.rf.gd/alcoholic_liver_disease_case_report.pdf
    • http://lozibudakumanik.epizy.com/stay_hungry_stay_foolish_novel_download.pdf
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_6b3a4b8bbff04ce4bf665161a9f62810.pdf?index=true
    • https://7abbf572-6989-4614-8246-9d5ba34cd238.filesusr.com/ugd/af841b_319884bb32b847a6b983257ec7dae6b8.pdf?index=true
    • http://roninifuwevol.rf.gd/cadastral_information_south_africa.pdf
    • http://rilevoka.rf.gd/loud_alarm_clock_app_for_android.pdf
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_6275c13cb1d94f02a344c1c8347b973c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f67b.bin
1b785d5841775c2a81190b250917d5e2704497c6fd207a27695165ad910b4954		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 5860 bytes
font_01_sfnt_off0001098b.bin
85280373b2b173696168a285baeed661a0fc2169bf0bfa7d5e6ac5c41309a73e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 11452 bytes

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