Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd764cef59d264f1…

MALICIOUS

PDF

77.6 KB Created: 2021-03-12 20:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c1799df28fc2040add6d949aee4de582 SHA-1: 90f520c113a0f25c28d7f2147eb6206e82ff3114 SHA-256: dd764cef59d264f14c0e885b12c58f5c1e7e4026a904a26688c89fbbaeaa313b
146 Risk Score
Tags
free-cdn-ebook-manual-lure

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://fokemale.ru/strik?utm_term=what+crimes+have+no+statute+of+limitations+in+illinois PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388427/normal_602d7120b8563.pdfIn PDF document text
    • https://cdn.sqhk.co/segevenujuka/IguiaGM/rusolibi.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxodinumoro/cPchcig/zofowopovoxeliwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413370/normal_601350307fd58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459463/normal_5fde668e957a0.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/fjghczK/best_buy_customer_service_specialist_job_description.pdfIn PDF document text
    • http://lanasobewusek.22web.org/cape_hatteras_fishing_report_surf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_600a059d28a73.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/why_wont_my_mic_let_me_talk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503524/normal_5ff497ae16cef.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/Fhe7gyp/rusumekilemebuzidagotup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369168/normal_6049753e00d82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465400/normal_600f1e8882579.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wowutuzineko.myartsonline.com/an_integrated_approach_to_strategic_management.pdfIn PDF document text
    • http://rojanesifilagu.myartsonline.com/bosch_nexxt_500_series_washer_disassembly.pdfIn PDF document text
    • http://mawesawikatunus.epizy.com/plant_virology_matthews.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 5192 bytes
SHA-256: 4bdfc7445a08bd31481582a30e0c142c97cbe54153554a16e5bb529dcc9deb1b
font_01_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 10992 bytes
SHA-256: 0883a5c2ab9170901b88790cc66c1723a3ad214ccb12013998ad1169a66d38c9

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