Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac022501eddb9061…

MALICIOUS

PDF

84.4 KB Created: 2021-03-16 22:45:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 69b5aa5f580e84a93329ea9315034ce2 SHA-1: 92f4216cda5bc81aae622c70cebbf8e1cbc5b095 SHA-256: ac022501eddb9061f59fbef788325ad3ae570ba08a72000fee6e0cec257bb0e3
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=what+time+can+i+start+my+snowblower PDF link annotation
    • https://cdn.sqhk.co/puwupasakej/a5LAhcy/jateguvosajonikadatojule.pdfIn PDF document text
    • https://cdn.sqhk.co/jotoselu/hdhfhaq/amc_rent_a_theater_ny.pdfIn PDF document text
    • http://m-ryanaf.site/32862486666r568z.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/gOAcvib/top_rock_albums_2020_billboard.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/what_are_the_lexile_levels_by_grade.pdfIn PDF document text
    • http://sodalabs.pro/scriptures_on_unanswered_prayersw2c9q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_60152b44c7ea3.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/would_you_rather_questions_to_ask_a_guy_dirty.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/19955150748w3ufq.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/sujok.pdfIn PDF document text
    • http://mifvideo.space/convert_repeating_decimal_to_fraction_worksheetsuf3a.pdfIn PDF document text
    • https://cdn.sqhk.co/tilomulobet/eBhesjc/pujuzo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461751/normal_6004a43301bfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379489/normal_602f2da470dcb.pdfIn PDF document text
    • http://creditreportus.info/neet_biology_syllabus_2018rlr5c.pdfIn PDF document text
    • https://cdn.sqhk.co/lexuxeza/h4gcngf/46701682282.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/8jcjbhf/54632083255.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/setigafat/what_thickness_rope_for_tree_swing.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/hyderabadi_miya_bhai_song_mp4.pdfIn PDF document text
    • http://pusebirenox.myartsonline.com/how_long_has_mason_crosby_played.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/87548005061.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_off00010e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 5388 bytes
SHA-256: eabd8c763a8324cd935f9cd330075ed8d5aa2c5b1dbb476d62ed89aea2399e15
font_01_sfnt_off00012044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12044 10536 bytes
SHA-256: 7a4f7485a99eef426bb344ccec89113a8d211ee295130fd51d882b914576ac4c