Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53b2a35d8cb8949…

MALICIOUS

PDF

79.1 KB Created: 2021-04-07 09:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b043b1504e1e1e325860b76f12d11f34 SHA-1: 06ff44628a01b87d551b6f56552be7d1d9485b33 SHA-256: c53b2a35d8cb894903412b9f6d364aca158695759fd8021c765f9e65c2301fa7
144 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF_SEO_UTM_REDIRECTOR_LINK heuristic suggests the document is designed to lure users into clicking a link, specifically 'https://maypoin.ru/wix?keyword=how+to+change+synapse+x+theme', which is likely a phishing or malware distribution page. The document body is heavily obfuscated, but the overall structure and heuristics point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://maypoin.ru/wix?keyword=how+to+change+synapse+x+theme PDF link annotation
    • https://cdn.sqhk.co/zezetemirag/D2eijhH/football_betting_strategy_soccer.pdfIn PDF document text
    • http://rebezun.mygamesonline.org/karcher_repair_near_me.pdfIn PDF document text
    • http://2gusevshop.space/72062304670zd42w.pdfIn PDF document text
    • http://copyrightnotices-form.com/rg59_coaxial_cable_data_sheetrhi2m.pdfIn PDF document text
    • https://cdn.sqhk.co/fagiseregu/Iggighs/fly_racing_motocross_helmets.pdfIn PDF document text
    • http://riragukigud.scienceontheweb.net/xixixa.pdfIn PDF document text
    • https://cdn.sqhk.co/libavesonon/geNha3Q/first_aid_supplies_online_seattle_wa.pdfIn PDF document text
    • http://gaximivotekole.mypressonline.com/krishna_bhajan_lyrics_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/svzzDjb/31226239110.pdfIn PDF document text
    • http://rovanenafet.getenjoyment.net/free_coloring_bookmarks.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/fPtuji1/leduvepuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad496356-7671-48c1-bb51-29c32278a0ea/fafomavewigugituw.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/what_is_intellectual_disability_mean.pdfIn PDF document text
    • http://wipibefab.onlinewebshop.net/77434546382.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/biseruxupinuzevipugonupa.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/minecraft_aether_mod_1._14.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/19850669729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e66172c2-6af9-4041-b631-fce2ecfe37f8/52491630938.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/bushnell_the_truth_rangefinder_flashing_y_and_m.pdfIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/xoxag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/455ea364-4bd1-48bd-8750-57eddd2d7c3d/41925866213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4141a44c-7982-4edd-aa77-ccb86dbd493b/harry_potter_books_set_cheap.pdfIn PDF document text
    • http://luxupovokajaf.onlinewebshop.net/anthropometry_handbook.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/bronchitis_akut.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_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 5444 bytes
SHA-256: bac507971e19613f78a3346053524c63be05c086463e2102db6e53d7a2cf44b0
font_01_sfnt_off0001080c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 11380 bytes
SHA-256: ff16f1dfda0ca1edf35a7d69b780d59ff68b841d8f5bd151493946b3b51fdf7c