Malicious PDF — malware analysis report

Static analysis result for SHA-256 538057258274b8e9…

MALICIOUS

PDF

79.2 KB Created: 2021-03-23 06:43:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 67514aef749eae5989ad9084fa4d24c3 SHA-1: 08a8c1b3b1d07543d07d4ea7fee6e7ae7ca81f1c SHA-256: 538057258274b8e902171c9b25cf40ffb4867810d8420c7d02b879b898a8d6dd
134 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many hosted on disposable domains, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of a 'download button' heuristic further supports the attack pattern of luring users to click on links that lead to harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/award?keyword=ignou+assignment+cover+page+pdf+2020+19 PDF link annotation
    • https://cdn.sqhk.co/dagosasojo/eRhhWwZ/isp_sub4sub_improve_channels.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469128/normal_600841e3788d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376629/normal_60148919c9496.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/F5WggDB/83480847605.pdfIn PDF document text
    • http://milanomoda.site/dilapidations_settlement_agreement_templateey86s.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/how_much_money_do_detectives_make_in_australia.pdfIn PDF document text
    • http://fesalasan.mygamesonline.org/data_addressing_modes.pdfIn PDF document text
    • http://gouliwer.online/12789255565zs89i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485589/normal_6039465eaf19f.pdfIn PDF document text
    • https://cdn.sqhk.co/ninilevikod/o280Bac/chirutha_movie_songs_naa_songs_me.pdfIn PDF document text
    • http://legrand-spb.ru/genaxo6wo5h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zidenigad/15676504214.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/android_dragon_ball_z_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/bajrangbali_song_naa_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a7ad76-c50f-44d2-a326-8a722281fc5b/53335006704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b268dd3-ca75-4bda-a6ad-573f37779956/a_fine_fine_school_book_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/recurrent_herpes_labialis_treatment_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33d0f2e3-f966-48c1-93d2-d122efbbfde5/63263948123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8871f5a-b97f-49de-abaf-d677fcde0f12/death_note_manga_anime_unterschiede.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE701 5804 bytes
SHA-256: 1c51d6ceaf2b1086f35d26270db6fcdfbd2953f0e9af44018545530481c83364
font_01_sfnt_off0000fabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABF 10836 bytes
SHA-256: d221dd494eb492bf260ea1b55439c718af05b495ae11d0f9bb2e6e58b39ba4cd
font_02_sfnt_off00011fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA4 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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