Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33440579202d2d6…

MALICIOUS

PDF

88.8 KB Created: 2021-03-18 00:38:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 1c417b2051fa262ba907edccba5c7163 SHA-1: 6040f108893b010f406dcb7be375703f0339d86c SHA-256: f33440579202d2d69ded0bb67262841e2ba6ac5fc063335ce3053c8c075e39e3
146 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with several pointing to disposable domains and one specifically designed to mimic a search result for a book. Heuristics indicate this is a link farm and a phishing lure, consistent with malware distribution or credential harvesting. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/wix?keyword=biochemistry+concepts+and+connections+2e+pdf PDF link annotation
    • http://copalofa.site/conversation_interview_questionsrzo98.pdfIn PDF document text
    • http://solent.bar/harry_potter_part_5_full_movie_in_english5ksr2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382965/normal_60058315bf8f5.pdfIn PDF document text
    • http://promoocaoameericanas.com/ruins_of_adventure_ad_darkll9dm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413693/normal_605280a303b28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382405/normal_600a02faba1a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369504/normal_5fc83bdb6f6c0.pdfIn PDF document text
    • http://shopsupergood.site/wesamikalalumobitowebewew6qy65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373992/normal_5fef8a9ed97d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485943/normal_601243cd23fdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488804/normal_6045143897d17.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/browning_hi_power_mark_ii_vs_mark_iii.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391315/normal_6029049ae2053.pdfIn PDF document text
    • http://reactivascotia2020.com/powerpoint_design_templates_engineeringey9j0.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/viper_lc3_4706v_installation.pdfIn PDF document text
    • http://kinoxca.xyz/12698043847nvunm.pdfIn PDF document text
    • http://lejifip.sportsontheweb.net/vopavurazisigevozudelowoj.pdfIn PDF document text
    • http://fastnoutservice.ru/1965_john_deere_110_parts4va65.pdfIn PDF document text
    • http://esportzmlevent.com/jewuzumuzasofdz10x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416500/normal_60486b9d8e4a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/47e75fd9-0e6d-4817-96d4-8569a8fecb01/71770600434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0485aa68-f39f-4386-9729-d2fd332b374e/how_to_tackle_stress_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29d9de2e-9213-460b-aa80-5cdef990e88a/65053102299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e28fa293-91f4-4991-949f-5809c185a9c2/dr_seuss_books_online_text.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5b79d5-30ef-4098-a239-308ac1901336/what_is_the_difference_between_dawn_and_dusk.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_off00011c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C36 5644 bytes
SHA-256: fcf3b892106bbe8aea97e39dda17dc5fc5c82f3a69af50f7ba8495e125064b02
font_01_sfnt_off00012f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4C 10852 bytes
SHA-256: e8d56ba3b1193eba32926152e9b04b8dec79b6831f7d8a418a5b4f7de289b71f