Malicious PDF — malware analysis report

Static analysis result for SHA-256 188350caaa3d175c…

MALICIOUS

PDF

75.8 KB Created: 2021-03-30 18:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 048c229c55f3b42b9a0aba30815a9be1 SHA-1: 9e7e84c6044c8f0e9d829d85f2301845fd72d7ca SHA-256: 188350caaa3d175cf6c54802a034304ec7e865cdfe1021cbe2a40aee326e98c7
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a common tactic for link farms used to distribute phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://gimoguvi.ru/award?keyword=deductive+method+of+research+pdf PDF link annotation
    • https://cdn.sqhk.co/nobukomorur/pieQghR/vawomidetoxepig.pdfIn PDF document text
    • http://zumubexupon.22web.org/beat_maker_go_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/BghOmgg/kaththi_sandai_video_song.pdfIn PDF document text
    • https://cdn.sqhk.co/dusimefosix/nGggidX/zoom_cloud_meetings_apk_for_android_tv.pdfIn PDF document text
    • http://muriwilosakud.iblogger.org/my_talking_angela_hack_ios_free.pdfIn PDF document text
    • http://nuxulaxidiga.iblogger.org/affect_vs_effect_worksheet_with_answers.pdfIn PDF document text
    • http://fallofelin.online/chhota_bheem_tamil_video_mp4fg65o.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/if2jb1B/timidakeralalamadufijal.pdfIn PDF document text
    • http://repaircreditscore.info/dream_interpretation_ex_boyfriend_new_girlfriend_pregnanthnm26.pdfIn PDF document text
    • http://prodson.space/samsung_rs261mdrs_ice_maker_reset_buttonl83uu.pdfIn PDF document text
    • https://cdn.sqhk.co/nilulugaj/yvjihfD/84432878393.pdfIn PDF document text
    • https://cdn.sqhk.co/kixepijap/jhjciah/scalextric_arc_app.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/gtlIogg/zonixesijegexedopeged.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_fbe9dad45ecd488ab050fee31432a5f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/26340928759.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/pensum_medicina_uasd_plan_14.pdfIn PDF document text
    • https://488a161d-122f-4e25-b35e-34d1d0e27b34.filesusr.com/ugd/bbc910_396dee242754419799a7a02b19c7cf90.pdf?index=trueIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_c1b54cbdfa9d49b296b9835049f125e2.pdf?index=trueIn PDF document text
    • http://xelilurezo.epizy.com/43498995828.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/zawuwipotujo.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/ayatul_kursi_english.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/punezivukuwotozumevefu.pdfIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_8c5da7e655ae475cbe41325996e21789.pdf?index=trueIn 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_off0000eaad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAD 5424 bytes
SHA-256: b0bf7146e138a448d312c7e03b55e3a62819cfd4fa05494c7146391c395d6b5c
font_01_sfnt_off0000fd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD04 10748 bytes
SHA-256: f9655a7fcc22bf666e057df14db33372c903af264d4697a78ead0986cb209698