Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb454bec88d5f94…

MALICIOUS

PDF

104.0 KB Created: 2021-03-29 19:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85549ee514dd5da736da72cc4c3e08ed SHA-1: 81f90740d5d3aba8398e0307170f0f6939bf3e53 SHA-256: bbb454bec88d5f94d4df6b62125c3fb7581d2ade81ee17970d73e8f74fa1eb53
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains an exploit. The presence of numerous external URIs, including a link farm on disposable hosting, suggests an attempt to redirect the user to malicious content or download a payload. The heuristic 'SE_DOWNLOAD_BUTTON' further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/wix?keyword=adb+push+apk+to+system
    • http://gezakiribonenin.mywebcommunity.org/83632459860.pdf
    • https://cdn-cms.f-static.net/uploads/4376371/normal_605382541ab47.pdf
    • https://static.s123-cdn-static.com/uploads/4422894/normal_5fe44c957794a.pdf
    • https://static.s123-cdn-static.com/uploads/4389606/normal_5ffe8c07183bc.pdf
    • https://faperusa.weebly.com/uploads/1/3/1/4/131454178/mewesip_vudarilojet_futimolabon.pdf
    • https://pupaxutakigi.weebly.com/uploads/1/3/4/5/134579126/fiwoweruvubus-vuditagifat-vunula-wojadagen.pdf
    • https://kimidagox.weebly.com/uploads/1/3/4/4/134470984/wanamurexeposedewux.pdf
    • http://disozire.mygamesonline.org/81245916273.pdf
    • http://womotov.22web.org/lala_ramswaroop_calendar_june_2020.pdf
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/vakovojafe.pdf
    • http://maporirunigis.22web.org/time_table_for_world_cup_2020.pdf
    • https://pajujetijawu.weebly.com/uploads/1/3/4/3/134334360/bulekinesuruxewulu.pdf
    • https://cdn-cms.f-static.net/uploads/4376404/normal_6056861bed693.pdf
    • http://bugiwuxad.medianewsonline.com/atmel_avr_studio_6_tutorial.pdf
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/95a1a.pdf
    • https://suzazega.weebly.com/uploads/1/3/4/4/134476369/tozel_mivamula.pdf
    • https://cdn-cms.f-static.net/uploads/4461516/normal_602aeda65abfd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tifilow.onlinewebshop.net/how_to_strip_demi_permanent_hair_dye.pdf
    • https://uploads.strikinglycdn.com/files/ef95768e-dab8-4ede-8c93-e4ec77d1301d/history_between_china_and_taiwan.pdf
    • http://moniladipawi.epizy.com/becoming_a_professional_life_coach_free.pdf
    • https://uploads.strikinglycdn.com/files/54ecaff3-e51e-41c0-9605-1fae8a1dc7b3/white_fang_summary_chapter_3.pdf
    • https://uploads.strikinglycdn.com/files/4707b8ee-1c36-486c-b1b2-627174c69ab0/karcher_parts_manual_download.pdf
    • http://robojarudilore.epizy.com/refraction_of_light_at_plane_surfaces_class_10.pdf
    • https://uploads.strikinglycdn.com/files/b78b4314-95e0-44ed-a136-9ccef072c187/how_does_diversity_contribute_to_innovation_and_growth_within_a_business.pdf
    • 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_off0001574d.bin
47a436f9c19c58c92e857b3a07ad82cf85e053958e0489543cb23d752178b237		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1574D 5364 bytes
font_01_sfnt_off00016968.bin
132760f2c7c2ead7fd6c8b143eb108e38bece35aeb160f8dcdfd86b5809d62e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16968 11808 bytes

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