Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d81cdfd2c763703…

MALICIOUS

PDF

79.1 KB Created: 2021-02-25 12:50:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e9af5253d8486400b781cdebf9d35276 SHA-1: 8c78e2cbb734ea3bf04c502a28ded6678244c7c1 SHA-256: 6d81cdfd2c7637038af7f71ffce97d91d619e88f658d90796f1f22395fdde81e
146 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://druttle.ru/123?utm_term=honeywell+radiator+heater+recall PDF link annotation
    • http://poxumanavofeboz.scienceontheweb.net/how_to_uninstall_hulu_on_lg_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/b0Ak8T4/energy_consumption_analyzer_ios.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/netosavitulu.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/aswc-1_harness_installation.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/bissell_powerforce_compact_turbo_2690_belt.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/herhKMK/sadixadusuxaxoke.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/rhyming_dictionary_for_kids.pdfIn PDF document text
    • https://dumaxenuwumav.weebly.com/uploads/1/3/3/9/133997891/1756674.pdfIn PDF document text
    • https://luxufaxunixepu.weebly.com/uploads/1/3/4/5/134584211/d2982.pdfIn PDF document text
    • https://cdn.sqhk.co/fokatekox/8ygf7gg/alien_bug_defender_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mewuwemiromi/icgcjfD/masapewufufojivawofu.pdfIn PDF document text
    • https://wuwosafojopog.weebly.com/uploads/1/3/1/4/131407683/sepifil.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/28018107938.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dozipebijegubig.epizy.com/88965003223.pdfIn PDF document text
    • http://zapudeni.epizy.com/bully_mod_apk_data_lite.pdfIn PDF document text
    • http://zovavabiw.epizy.com/gawenepodemabumebekadobo.pdfIn PDF document text
    • http://tunowik.epizy.com/sefabedokaru.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DF 5004 bytes
SHA-256: 762d28bf5d9a7200ee86ded467327b410d00ada414574f3d5be1d098f4d0bdf5
font_01_sfnt_off0000f5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 10656 bytes
SHA-256: 7d1a3636f43f5f52a0e7aee6fd6d9d564b9d7fe8704d7f488f82438886e443f5
font_02_sfnt_off00011a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7E 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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