Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e7bb39dd1e5edca…

MALICIOUS

PDF

77.5 KB Created: 2021-03-14 08:06:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d2dcc1d8c1c04373d1c735bdc4605652 SHA-1: a9331ecf5f0b2d24951013bcd7ed2a13b26a65e9 SHA-256: 6e7bb39dd1e5edca9c357ba5216486676f6e260fe6d44c6db66ebe8ea0e45fd9
144 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains multiple embedded URLs, with a primary redirector identified as 'https://seumenha.ru/123?utm_term=ff13-+2+guide+pdf', suggesting a free download scam. The document body, though heavily obfuscated, contains metadata consistent with PDF generation tools, and the presence of numerous links points towards an attempt to lead the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://seumenha.ru/123?utm_term=ff13-+2+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/xonipavu/bfifibg/download_bike_race_3d_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/T5Djbig/hearts_card_game_rules_for_two_players.pdfIn PDF document text
    • https://cdn.sqhk.co/kogoruzojif/hbjcYia/rexuj.pdfIn PDF document text
    • https://cdn.sqhk.co/fajixojemom/kgdkEGo/65561578982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_6018ee598d9d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_600eab22d1823.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/NFuicHY/checklist_for_wedding_planning.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/hggfhbC/11569922630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497359/normal_5fe656c11c2f7.pdfIn PDF document text
    • https://cdn.sqhk.co/bowewulaxam/gg4jcJe/nostalgia_mini_popcorn_maker_instructions.pdfIn PDF document text
    • http://zabidegelid.iblogger.org/can_chiari_1_malformation_cause_dizziness.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/fprz4ih/7_years_old_lyrics_words.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450421/normal_5fcf9ed05729e.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/WKHvRzL/jubekanovoxepatinojosen.pdfIn PDF document text
    • https://cdn.sqhk.co/mamidusidozu/dlghoge/game_of_thrones_cast_season_6_episode_10.pdfIn PDF document text
    • https://cdn.sqhk.co/dufimogemeka/BIThiig/taxedireso.pdfIn PDF document text
    • https://cdn.sqhk.co/bedazume/WhbnMig/56894517105.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/ihbJMgc/freeze_dried_strawberries_target.pdfIn PDF document text
    • https://cdn.sqhk.co/dedikunakudu/jgDhhjj/monkey_banana_mp3_song_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tijexaxa.epizy.com/sanakemigilijiriraju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7397c1e-facb-45ce-ae21-90ce9034594e/how_to_steam_broccoli_in_oster_rice_cooker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b77e9d39-4a7c-4fa3-b60b-bc608c00a2dd/36117023753.pdfIn PDF document text
    • http://faperolakaf.rf.gd/comment_fusionner_2_documents_sur_mac.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_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 5028 bytes
SHA-256: d915f912e1aed4c6460ef160b548e14572d483901e47fd76603267991c8bc602
font_01_sfnt_off000105a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A6 10312 bytes
SHA-256: cf7272a7ff343a2a9c2754870a77580b74e197429ec9cd4c564afcbde9932409