Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1dd6bb4a8a501e9…

MALICIOUS

PDF

76.4 KB Created: 2021-03-08 14:14:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d193bcb8a680736c5716779d26215882 SHA-1: 5ebccf4442bdf3725a9d0ab1501f6023922c1507 SHA-256: a1dd6bb4a8a501e936148a81b002bdd90d7a1bd86bb6cb739777c2cbd59245e9
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of external links are often used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/award?keyword=september+2020+calendar+printable+pdf PDF link annotation
    • https://cdn.sqhk.co/vitimosugu/gcjarhb/r_b_music_artists_of_the_80_s.pdfIn PDF document text
    • https://ranemexamegen.weebly.com/uploads/1/3/4/4/134440137/2545038.pdfIn PDF document text
    • http://fakereruzab.iblogger.org/finite_spherical_well_bound_states.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/jbBggie/wenupagebugobazatenixu.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/7584281.pdfIn PDF document text
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/7369179.pdfIn PDF document text
    • https://xosesobo.weebly.com/uploads/1/3/4/6/134697532/8408499.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/7STiiKn/save_earth_quotes_in_malayalam.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/Ghfu2jj/art_education_graduate_programs_pennsylvania.pdfIn PDF document text
    • http://pabazumakubonok.66ghz.com/megalovania_sheet_music_for_clarinet.pdfIn PDF document text
    • http://zepofevof.22web.org/73721988582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421611/normal_5fdc568c00fdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480755/normal_602092b93a448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404745/normal_602f98522a472.pdfIn PDF document text
    • http://sikepelisu.22web.org/adblock_plus_pour_firefox_android.pdfIn PDF document text
    • https://cdn.sqhk.co/lamidipeke/EBZjhii/suvimo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_54c8827dcfa14b86b7ce214d049e7bb2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/new_bhakti_audio_song.pdfIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_d83505974e7f475184b77a796d5b35db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/tixap.pdfIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_a17d5ae7d1934b0f9c4a66bb3b8da381.pdf?index=trueIn PDF document text
    • http://sowawobajomo.rf.gd/how_do_i_fix_my_tv_remote_sensor_not_working.pdfIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_63b05f029765482f8aa295beeb028589.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejeseja/guided_fishing_trips_in_maui.pdfIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_a0ad6f95096743e2a4b5134cb0f10fe8.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_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 5640 bytes
SHA-256: 361a47ba9fd3d162ea3db063a325e15e2e7942b02b55989743c54cc82ab0031b
font_01_sfnt_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 10640 bytes
SHA-256: f5d467ed672d54f66a2dfd4c2bc8e15ee94c08ca25409367216aa3dcf6960e20