Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f77abceff788ce4…

MALICIOUS

PDF

76.7 KB Created: 2021-03-28 19:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c25e8b90b215a9a989b05600d35ee68a SHA-1: d8ffaaf50504a8245ca09586dc7d75b462a66beb SHA-256: 9f77abceff788ce488d9cd77e23dde4ab43a37a2c813f50d10feb68a73d80bbc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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 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://jumiwimov.ru/strik?utm_term=pioneer+vsx+1022+remote+control PDF link annotation
    • http://vajesafosedepur.mywebcommunity.org/sevefiserurefaka.pdfIn PDF document text
    • http://ruvikuvi.mywebcommunity.org/russian_orthodox_bible_in_english.pdfIn PDF document text
    • http://zeropium.com/before_we_were_yours_new_york_times_book_review92ig4.pdfIn PDF document text
    • http://baranaydin.org/39593838473uiys0.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunabem/iQQigih/bard_leveling_guide_aura_kingdom.pdfIn PDF document text
    • http://raftgjgr.space/70515243576hiihn.pdfIn PDF document text
    • http://sehq.xyz/business_analytics_graduate_programs_texasbt6l8.pdfIn PDF document text
    • http://startask.ru/air_force_1_low_white_mens_near_me8rxhv.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/vjcEjbk/anger_of_stick_1_mod_apk_home.pdfIn PDF document text
    • http://ledozikatiresev.scienceontheweb.net/96507358119.pdfIn PDF document text
    • http://copyrightproblem.com/24966833774j264h.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/3974495883865h5i.pdfIn PDF document text
    • http://lamalegujig.22web.org/lectores_en_red_loqueleo.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/gf5jdGe/chess_piece_moves_list.pdfIn PDF document text
    • http://fojefojegut.medianewsonline.com/cae_exam_practice_tests.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://linuxuxotarife.rf.gd/mortal_instruments_film_series.pdfIn PDF document text
    • http://pefoxaxogux.epizy.com/renigonodufazeloxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f701aa9-23b2-417e-a50c-df8b04181569/average_sat_essay_score_for_ivy_league.pdfIn PDF document text
    • http://girinuluzu.rf.gd/72447314503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33185ad9-209c-4a3c-9d88-c242ae9a4a03/91637136435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63291db6-634e-4f14-862f-b0f5cede2376/is_thinkorswim_real_time.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_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 5192 bytes
SHA-256: a34bd436b879895c95692bddbbdef840999a7bda543e791633a1bbb6f0155c21
font_01_sfnt_off0001005a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 10928 bytes
SHA-256: 8202c1e89e3b9e9fb5ae34d6bbe5ee9e81d997dcbb550beacd871ddd2dde2267

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