Malicious PDF — malware analysis report

Static analysis result for SHA-256 812b2f41499cd654…

MALICIOUS

PDF

75.7 KB Created: 2021-04-03 22:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 44d3051c1c3fabd123cc4ce849db21eb SHA-1: d32d9a2ea5d97a147fbdec0ce143490388f61853 SHA-256: 812b2f41499cd6542dc3c66a70a75d2cba4a2c5f171ade7d6857209a65fee950
194 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a malicious redirector link, specifically designed for phishing by impersonating a game guide. The embedded URL, https://dafemum.ru/123?utm_term=clicker+heroes+idle+build+ancients+guide, is flagged as a known malicious redirector. While no scripts were explicitly extracted, the nature of the redirector and the ML classifier's high confidence suggest a phishing attempt to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=clicker+heroes+idle+build+ancients+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_600a84e691ebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477400/normal_606395537510c.pdfIn PDF document text
    • http://helplnstagram-confirm.com/zonubuzopsrh8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495696/normal_5fcb1e7869629.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/dhgU4jh/danolujigazabiwitovubojo.pdfIn PDF document text
    • http://besiditiduw.22web.org/best_ebook_reader_for_android_with_dictionary.pdfIn PDF document text
    • http://fumodowovud.iblogger.org/badjao_culture.pdfIn PDF document text
    • http://future-techno.ru/sukojofunixizinipio8e77.pdfIn PDF document text
    • http://fishland.store/les_choristes_english_subtitles1o1hd.pdfIn PDF document text
    • https://cdn.sqhk.co/nexuliwadi/DghZqFh/532166850.pdfIn PDF document text
    • https://cdn.sqhk.co/miviterul/kibhhgd/40021596487.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/dYMbvcS/24212403413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_6028eac5eff64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389101/normal_602a14bced3fa.pdfIn PDF document text
    • http://copyrightprivacy.site/wikexakub2wj2.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/piradi/46689662658.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/58662637593.pdfIn PDF document text
    • http://fapugiv.rf.gd/zugasamonibuferip.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/56888147493.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/how_to_get_ghost_of_tsushima_pre_order_theme.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/lagu_sabah_original.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/haida_gwaii_surf_report.pdfIn PDF document text
    • http://dukizovisepo.rf.gd/dosakevobejavonufotufojab.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_off0000ea7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 5308 bytes
SHA-256: 6ebef4959e0a77a1362a025a9353a997ec4ab2d16c8324dd4f8c7dba27d59ce6
font_01_sfnt_off0000fc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7E 10808 bytes
SHA-256: a91c61c2d223480c03b82c168c0e8f41c22912d843d48a05177baaeb59de5ac7