Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fba3774758d32b7…

MALICIOUS

PDF

93.7 KB Created: 2021-03-29 22:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 031b4cc078d14636405ea40894634f21 SHA-1: dcd04f1b228e109bb405520d42168a098d673d47 SHA-256: 1fba3774758d32b7cafb02e754f45aadebbc5cea6ff95f83b64611de474f0860
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it's a malicious redirector, specifically linking to a URL associated with phishing lures like 'Golden tabby tiger spotted recently'. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URL is used to redirect the user to a potentially malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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/wix?keyword=golden+tabby+tiger+spotted+recently In PDF document text
    • https://wokewimafagi.weebly.com/uploads/1/3/4/5/134598023/zapoxodaveg.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/what_does_yellow_light_mean_on_belkin_wifi_extender.pdfIn PDF document text
    • https://bobovisosusare.weebly.com/uploads/1/3/5/3/135394734/sojufa.pdfIn PDF document text
    • http://kafalukuwemi.mygamesonline.org/how_to_make_a_breakbeat_drum_pattern_ableton.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489977/normal_604d3a899fc2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_60489047e5a52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465145/normal_5fee2c0c0bc42.pdfIn PDF document text
    • https://cdn.sqhk.co/velujuvaxal/2QHggha/naxuvisodowufatejam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394062/normal_6043b2d5e2f81.pdfIn PDF document text
    • https://cdn.sqhk.co/kugorazig/bn9gfij/h_and_r_block_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/redexisa/zTUhema/zemifomevo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421640/normal_5fef0c0c5d107.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/gjLfbha/tech_deck_skateboard_tricks.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/kasuwevovog/short_story_for_learn_english.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/manufacturing_engineering_manager_job_description.pdfIn PDF document text
    • http://kepelagivon.rf.gd/bouteloua_curtipendula.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/how_does_a_portable_air_conditioner_dehumidify.pdfIn PDF document text
    • http://jalasofumikom.rf.gd/effective_communication_techniques_in_nursing.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/anyway_you_want_it_drum_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/half_past_quarter_past_worksheet.pdfIn PDF document text
    • http://dubirapotemudi.rf.gd/bakunin_on_anarchism.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 6588 bytes
SHA-256: 746cda19d0a45b0d6108c63ff8192b2f88c2fff5e5937e692a7cb04b31166607
font_01_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 5516 bytes
SHA-256: 96f132443dda44f4f99ecdcef6c13dceb68af9a0590f7c68d27cdfbbf02223a6
font_02_sfnt_off000111bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BD 5364 bytes
SHA-256: 3371918144070c7c087fa6676074e888082835210d5be8eccd24c4014a4d9de8
font_03_sfnt_off0001219a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219A 12020 bytes
SHA-256: 6273c62295b2c31eb6d2a7cf4685b484f39dfd39cc7ec39512e897d5f73643da
font_04_sfnt_off00014a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A77 16384 bytes
SHA-256: 27d5aa48a66ed6e24074f1b6b97defbd08161f468927a62883f94c9ec160026f
font_05_sfnt_off0001602f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1602F 1736 bytes
SHA-256: f27f1dab863be407bc80ce69f069aaa000ada345c50a5fba1d6b915b5f603bb6

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