Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbccb2084b3717e…

MALICIOUS

PDF

83.5 KB Created: 2021-03-18 15:28:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 325be5a6298ff583ea21a6292143aa8f SHA-1: c93cdd62372928dc85dd3967e80b7d74e476296c SHA-256: 3fbccb2084b3717e4e9d27dada1602d5b18e29904e0c6712c43c71edbf4bd999
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a generated document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://jumiwimov.ru/strik?utm_term=online+hanyu+pinyin+to+chinese+character+converter PDF link annotation
    • http://tivepijezar.22web.org/how_to_know_what_size_pandora_ring.pdfIn PDF document text
    • http://gotuxeloso.22web.org/lyman_shotshell_reloading_handbook_4th_edition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425209/normal_5ff57ec5d2f0c.pdfIn PDF document text
    • http://wumupowon.22web.org/centrifugal_pump_operation.pdfIn PDF document text
    • http://koteyarn.moscow/vmware_hcl_serverqgh4y.pdfIn PDF document text
    • http://qqkaxes.xyz/how_to_create_a_user_manual_in_word_2013rr2sv.pdfIn PDF document text
    • http://vexirororap.iblogger.org/business_proposal_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451551/normal_604baee862f18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420459/normal_6029a24f64c59.pdfIn PDF document text
    • http://gosologesegob.iblogger.org/naruto_shippuden_senki_mod_apk_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buwumipulufi.epizy.com/82577041660.pdfIn PDF document text
    • http://relumewamamit.rf.gd/is_superstring_theory_dead.pdfIn PDF document text
    • https://4a7d9d2b-1d67-446c-8d6d-bdd3043d1f60.filesusr.com/ugd/c3d078_db6e500c509149b0b4d69023aef62308.pdf?index=trueIn PDF document text
    • http://pugapugene.rf.gd/megekivepobofepogerofa.pdfIn PDF document text
    • http://susesibukof.epizy.com/1145305804.pdfIn PDF document text
    • http://nupopejif.epizy.com/although_vs_despite.pdfIn PDF document text
    • http://rexawisoza.epizy.com/32170311818.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_bf627c74d5864605a90bde1ad5b196ad.pdf?index=trueIn PDF document text
    • http://wodefelid.rf.gd/punowumevudakajujenifoko.pdfIn PDF document text
    • http://buluperase.epizy.com/teaching_the_books_of_the_bible_worksheets.pdfIn PDF document text
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_020e5f56074f4defb8dd3c47a24a7154.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA1 5840 bytes
SHA-256: 34dc053ec5cdeb969273a8ef9fd1d4dc09f50d36c28bcac5b5c2f35e42a4c209
font_01_sfnt_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 5208 bytes
SHA-256: 41fe0b4caa8858195ff41de5685948da7512f792b617a9c8c7a180067c0dec47
font_02_sfnt_off00011288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11288 18908 bytes
SHA-256: 49ce2d9c715500786740ee9ad5aa5c3b81cc7b0e18d78dfd9e694d430bbb1afb

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