Malicious PDF — malware analysis report

Static analysis result for SHA-256 16734bd0bf6a44e9…

MALICIOUS

PDF

74.9 KB Created: 2021-03-07 02:45:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cf480bc0a7c42ab24a507af4ebb2fd5f SHA-1: 3188691c546f8c2ce5de2456120c8c3507a67d6a SHA-256: 16734bd0bf6a44e93a697fc252f5524b8929001e107372e2ca56326f0b195167
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the heuristic indicating a link farm on disposable hosting strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/award?keyword=night+mother+skyrim+quests PDF link annotation
    • https://cdn.sqhk.co/zesonixiv/jjgiEI1/xexaxagetapizefefobefa.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/55629435704g0sdy.pdfIn PDF document text
    • http://argo-tourism.com/531237545837lqvx.pdfIn PDF document text
    • http://jubigale.scienceontheweb.net/vazaparire.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375690/normal_5fe1eb172884f.pdfIn PDF document text
    • http://netewe8.xyz/funosavumokixipuviminuwuyelf7.pdfIn PDF document text
    • http://feyakast.online/is_bhagavad_gita_available_in_englishlzhs7.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/77194476330.pdfIn PDF document text
    • https://cdn.sqhk.co/wexufenu/gjgWc8L/lovecraft_country_episode_3_emmett_till.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/iiLijwv/draw_in_sign_language_asl.pdfIn PDF document text
    • http://bluetea.space/nj_realtor_rental_agreemente74vk.pdfIn PDF document text
    • https://cdn.sqhk.co/fujonexa/KigXZij/65818513017.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/kjdcF77/65087064872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408174/normal_6023349ca9006.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/tinezedu/bharat_full_songs_ming.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/sifagezoguxapip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb03a5b4-c35a-4f85-91c7-692b6a16b1db/star_wars_knights_of_the_old_republic_2_darth_revan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11a575e1-df03-4491-8fa3-20d3b5bfcef9/mtd_riding_mower_belt_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/gofedidalozakuzolawewa.pdfIn PDF document text
    • http://wejajesenopezoj.onlinewebshop.net/the_ultimate_guide_to_tarot_liz_dean_free_download.pdfIn PDF document text
    • http://fidegaf.atwebpages.com/jbl_lsr305p_mkii_price.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_off0000eaea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEA 5120 bytes
SHA-256: 3e88308dfa7b885339b4b381be40e342a534a873243f502b438c55ebf86eec39
font_01_sfnt_off0000fc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3D 10024 bytes
SHA-256: d089ef2c7c0567bf9c1d060dd9afbcde604c13289d3aa2768bc8ac9ca6aa94d3

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