Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8b8bb553c5e6e7…

MALICIOUS

PDF

85.0 KB Created: 2021-03-19 11:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b0fbc70eb4e5fe6abe7e033ffbf10aec SHA-1: 79aaf979eb96f55c714a6f012174cb1503a814b3 SHA-256: bd8b8bb553c5e6e7ddc7b368c21b4ae7905acd9bb521fdebb122d4299aa1d4d6
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high-confidence heuristic indicating it is a phishing lure, specifically using an image to redirect users to a malicious URL. The embedded URL and ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/wix?keyword=chapter+8+biology+review+answers PDF link annotation
    • http://bibuzikufaje.mygamesonline.org/cryogenic_rocket_engine_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377114/normal_60120f3e6dc5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465131/normal_5fe69fb55c1a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456685/normal_5fdfba12718f1.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/ghgdNjg/fuvozabo.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/ijLXY92/4668359967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475577/normal_6019919e439c4.pdfIn PDF document text
    • https://cdn.sqhk.co/serutaja/fHjcFib/nogezojuxafojugis.pdfIn PDF document text
    • https://cdn.sqhk.co/melalisopapu/ajgIhjd/steven_universe_amino_pt_br.pdfIn PDF document text
    • https://cdn.sqhk.co/jabakujivim/ibibGhe/13353045645.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/oiahgig/38297560978.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/2libjh3/7293718476.pdfIn PDF document text
    • http://melowimaz.getenjoyment.net/anxiety_disorder_types.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikalamo/icnEPie/41119830534.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/doxifuba/how_to_solve_a_rubiks_cube_the_easiest_tutorial_part_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5469b47-b45b-4afc-842d-fbccc8843cc7/story_of_your_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e00b5f7c-ca18-46f6-937e-cce1b049b6fa/vekitukosop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d2585e-8113-4655-accb-25bbf1a32d8e/what_fruits_are_low_fodmap.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/16263969015.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/93356698354.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/62368174018.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/structured_clinical_interview_for_dsm-5_scid-5_free_download.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_off00010d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D14 5572 bytes
SHA-256: 0778a6d78d8ee2b74487c1adae7e0629da734b85f821669aa3db359740a69b98
font_01_sfnt_off00012013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12013 11148 bytes
SHA-256: 235813565925e5cc5b956e6831e5efee871a30df77e5e3f151cfdcaa7f51267f

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