Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dee53e3413be3f8…

MALICIOUS

PDF

81.1 KB Created: 2021-03-17 09:22:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 856b21b5d37e006195839bff55f900ca SHA-1: 3fc4c2da1a4003bd41c669560599cd43e21e1d19 SHA-256: 9dee53e3413be3f83de6cc1f2cc966a87b7d54a392b2da195f2aa18d319f4115
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. Several heuristics, including PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, confirm this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/wix?keyword=proof+by+david+auburn+pdf PDF link annotation
    • https://cdn.sqhk.co/wufakinupo/hdjogeq/america_s_funniest_home_videos_bob_saget_intro.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/jiAbUEL/wumuvemimukuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/uhdjeij/video_maker_free_download_app.pdfIn PDF document text
    • https://cdn.sqhk.co/sijoputolu/5ichfGv/32733760917.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/bii5hbM/modern_house_map_minecraft_1._14._4.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/eihAjeY/lepenowepile.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/what_is_the_opposite_of_inverse.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/dibAijO/50253489022.pdfIn PDF document text
    • https://cdn.sqhk.co/rufomezin/rzgfxjj/fopugavotazixu.pdfIn PDF document text
    • https://cdn.sqhk.co/wexazaruko/gdhgS0h/724_area_code_time_now.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buzuvemujogumob.epizy.com/bible_study_lessons_for_youth.pdfIn PDF document text
    • http://xojixitutatafu.epizy.com/polaroid_sx70_film_near_me.pdfIn PDF document text
    • http://zepogofeto.epizy.com/boutonniere_deformity_finger_pictures.pdfIn PDF document text
    • http://supuwevul.atwebpages.com/garmin_echomap_plus_94sv_livescope_bundle.pdfIn PDF document text
    • http://zepukedosapiw.rf.gd/percy_jackson_and_the_olympians_movies_in_order.pdfIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_b1cd15d160314d4aa1824a9d2b615dc0.pdf?index=trueIn PDF document text
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_ee613fedf35a440290152115f9ecf3e8.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_0b359220a8594755a8f8cb0a2ff05c73.pdf?index=trueIn PDF document text
    • http://mevedodaxaj.epizy.com/foxconn_n15235_front_panel_manual.pdfIn PDF document text
    • http://vamanufa.rf.gd/33090197762.pdfIn PDF document text
    • http://lodusuvixad.rf.gd/21656346972.pdfIn PDF document text
    • http://webomaka.rf.gd/griff_hamlin_blues_guitar_unleashed_review.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_off00010168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10168 5128 bytes
SHA-256: 4e4b6633f501f143abbe8a5e33ae61babe1266821c377a573aff28976a60a06e
font_01_sfnt_off000112f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F2 10408 bytes
SHA-256: 5b355b85d59a53b796c87135c9e3bec4e5858ca4c06c120d3ec25cdc41c546b0