Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fb54df8b3be09e…

MALICIOUS

PDF

83.9 KB Created: 2021-03-23 03:31:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a157487993a43f39e902da10a397759c SHA-1: 12c5a532ffadbba15be15aac0e784eb71d9f58ee SHA-256: f4fb54df8b3be09e3edca4dae013eebc00b1b711e86890a2d244e7d2ea6533c4
206 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 0.9991

Heuristics 7

  • 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 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.
  • 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://resalured.ru/strik?utm_term=uk+theory+driving+test+booking PDF link annotation
    • http://majexifavel.scienceontheweb.net/konica_minolta_bizhub_c227_brochure.pdfIn PDF document text
    • https://rinadulig.weebly.com/uploads/1/3/0/7/130739308/ximipinifulizof_xekaw.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/Lhjfibv/wabirasijevek.pdfIn PDF document text
    • https://finazevad.weebly.com/uploads/1/3/0/7/130739247/bawofi-mufajinoragujan-teramofulub.pdfIn PDF document text
    • http://nijalatol.mypressonline.com/h81m-p33_audio_driver.pdfIn PDF document text
    • https://cdn.sqhk.co/jikowuzu/gjemUTW/red_ball_gown_prom_dresses_uk.pdfIn PDF document text
    • https://pukunave.weebly.com/uploads/1/3/5/9/135957849/e039eee49b655.pdfIn PDF document text
    • https://kotedakivon.weebly.com/uploads/1/3/1/6/131637811/d12ab.pdfIn PDF document text
    • http://fizarumokugafu.mywebcommunity.org/building_material_construction_book.pdfIn PDF document text
    • https://cdn.sqhk.co/bumegukomuza/gcfu47O/digital_marketing_plan_executive_summary_example.pdfIn PDF document text
    • https://pidowiwosuzaji.weebly.com/uploads/1/3/0/9/130969191/jojipefinujaruse.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/accounting_principles_kieso_13th_edition.pdfIn PDF document text
    • http://dejamorije.scienceontheweb.net/carnivalesque_bakhtin.pdfIn PDF document text
    • https://cdn.sqhk.co/nepusoliweda/ejcfhcT/equivalent_fraction_anchor_chart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_f89eaddaa0ed44b8b30bbba1acc8879a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nonabafat/game_anger_of_stick_5_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/between_the_sheets_cocktail_pictures.pdfIn PDF document text
    • http://bexukavibume.myartsonline.com/what_were_the_jacobins.pdfIn PDF document text
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_f545714b0bcf4aa98fc9c8a4e4f103c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/honda_hrc216_commercial_mower_parts.pdfIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_d3481d9070d64dd4b79ed99e9dbfcc4e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/amazing_spider_man_game_pc_demo.pdfIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_938f446b2edd4244819d46456998e0b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusixa/doctrine_of_discovery_1493.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_off00010a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 5200 bytes
SHA-256: d5d39a54726da5b5434939685e3415aad8ae5452ed032410566c0ff3a69ef9ce
font_01_sfnt_off00011bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEC 11080 bytes
SHA-256: 28b92d6ff8412405605f15781789ce48415209506d6630c2fd7e637ef7b0a648