Malicious PDF — malware analysis report

Static analysis result for SHA-256 892159689aed3b63…

MALICIOUS

PDF

78.2 KB Created: 2021-04-03 12:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: e424ed2ccb6f76ae81d865611dbb7278 SHA-1: 58a57ad4c5a2e811aec7ac6e81ab801706f5b9a0 SHA-256: 892159689aed3b63e588115fa84602c7a4d2521a00a0e0c297d4ecbc59908c06
134 Risk Score

Malware Insights

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

The PDF document contains embedded URLs, one of which is presented as a lure for 'anatomy and physiology coloring workbook answers chapter 5'. Heuristics indicate this PDF is part of a link farm on disposable hosting, and ML classifiers and ClamAV detections strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external URIs points to potential redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=anatomy+and+physiology+coloring+workbook+answers+chapter+5 PDF link annotation
    • https://cdn.sqhk.co/mosepoxik/jg1Rtai/sizivisimatu.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/ge8jbSk/basketball_total_free_shot_line.pdfIn PDF document text
    • http://pakizimavom.scienceontheweb.net/neguxasabumorifimoletoku.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/watch_star_trek_discovery_online_free44nx6.pdfIn PDF document text
    • https://cdn.sqhk.co/wituruxa/hgKhija/how_to_find_hidden_things_in_excel.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/panurixom.pdfIn PDF document text
    • http://wersita.space/thidwick_the_big-hearted_moose_meaningmo9xr.pdfIn PDF document text
    • http://creditscorecard.info/dbms_stats.gather_schema_statsownname__cascade_trueyaz8d.pdfIn PDF document text
    • http://it50save.info/kindle_ebook_reader_for_pcax9fu.pdfIn PDF document text
    • http://xizadewakali.iblogger.org/tisidavezakewumigigujakes.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/9ufeZiL/66932565097.pdfIn PDF document text
    • http://filanion.online/ridgid_planer_blades_tp13002vde3f.pdfIn PDF document text
    • http://megopoveguvujal.medianewsonline.com/nj_realtor_lease_application.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/EhjjgTx/24752179874.pdfIn PDF document text
    • https://cdn.sqhk.co/vivupedasez/iiajgi5/pelijumujusiwagofebomu.pdfIn PDF document text
    • https://cdn.sqhk.co/zurajekiviw/cjjKTLq/dabozudepavori.pdfIn PDF document text
    • http://pojitutujux.22web.org/burifasanotejav.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/fizup/praise_and_worship_songs_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/tempest_by_shakespeare.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/archery_guide_kingdom_come.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/how_did_the_second_great_awakening_affect_the_womens_rights_movement.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_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 5996 bytes
SHA-256: c5bcb3ae092c7aee1ae9764c1a16e240febf9d1d52dd06317da68115e285717a
font_01_sfnt_off000105fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 10936 bytes
SHA-256: 3393e9728f6bfc9c26c88c24613f36431afd1bdf3b4946a452f9b9dbe2f966dc

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