Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b0327b7e6fcc7a…

MALICIOUS

PDF

62.4 KB Created: 2021-01-29 06:28:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 5633c7b004b572327856e8842705d56f SHA-1: ad8520c6fbd8543eada708e0a785feac9df420c4 SHA-256: 18b0327b7e6fcc7afad05db60057baf36fb944bf79afe4c7ed2b5eb0c8133b8d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to suspicious domains and identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://yafferge.ru/aws?utm_term=ag+word+family+worksheets+pdf In PDF document text
    • https://cdn.sqhk.co/ruxuvedije/hiCja3a/italian_music_ringtones_free_download.pdfIn PDF document text
    • https://fuzedefona.weebly.com/uploads/1/3/4/5/134578490/666107.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/GghiaSn/galactic_conquest_mod_battlefront_2.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/hjhihbn/raxokow.pdfIn PDF document text
    • https://fojefutitamok.weebly.com/uploads/1/3/3/9/133989463/5826615.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/FgfGsjc/birthday_cake_images_for_child.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/figieNy/dream_daddy_joseph_cult_leader.pdfIn PDF document text
    • https://cdn.sqhk.co/mirusopujame/hhjejbx/11575312498.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/TLvEdy2/49969745514.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/wanasuvedigo/backpackbang_manual_request.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/badland_2_premium_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/cloudformation_get_subnet_availability_zone.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/8_ball_pool_games_free_filehippo.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/does_apple_watch_connect_with_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/watch_dogs_2_walkthrough_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/69234630639.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/2015_dodge_challenger_owners_manual.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_off0000b61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61A 5700 bytes
SHA-256: bebc4a5233450998c15cfacfe9a2bf4e5a26b3ecee27f8ce85571d32ca7a89d9
font_01_sfnt_off0000c97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97A 10304 bytes
SHA-256: 4c46575e632958938099f20c4f6cd72d4f282e15eb3b3c7ee61dd7f2c3580624

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