Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88f4cd95383629a…

MALICIOUS

PDF

77.3 KB Created: 2021-03-15 07:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b155af03b2245cecbde0c081f96b11f5 SHA-1: 02b3ef217077a3bb14e8fb27e010a6ed544d2622 SHA-256: a88f4cd95383629a21dcf241b9edeccffa149ecfaff532d0178f23a71a802ba4
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI that redirects to 'https://gimoguvi.ru/wix?keyword=arizer+solo+2+manual', identified as a phishing lure. The document body is heavily obfuscated, but the presence of external links and the high confidence scores suggest an attempt to trick the user into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wix?keyword=arizer+solo+2+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490724/normal_6042c5272b970.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451752/normal_5fe48277e6519.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/evicted_matthew_desmond_chapter_summaries.pdfIn PDF document text
    • http://miromawetibikew.mywebcommunity.org/fight_club_movie_script.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_601b11864f387.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505363/normal_60004b1e98a40.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/vatosolikijike/76364835227.pdfIn PDF document text
    • http://noxudabewoxedit.rf.gd/875489972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b9b9b8-65c9-47b2-9459-413239bf53a1/ximomubebujosegonapijudop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c54b157-bebd-45aa-8ee9-dab2298f9110/how_to_create_google_my_maps.pdfIn PDF document text
    • http://dirojuriju.epizy.com/centurion_2010_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/12019121905.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/grammar_practice_book_grade_3_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/zapubiwobov.pdfIn PDF document text
    • http://sugudilun.epizy.com/tujibijamiruzamebamarer.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/xejaluwukovudirijezajezo.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/32078148185.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/checkerboard_platform_vans_black_and_white.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/anomalisa_movie_480p.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_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 5000 bytes
SHA-256: e9df60be38d0f489270bc714e6765c1804213397a8c6a9576ce65772d2c4b5f6
font_01_sfnt_off0000ffd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD9 11456 bytes
SHA-256: f74451171b2bdb76ee208a3c3faa2a5d7ce30bb84c8e3d957d93cc3b1c3550ef

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