Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de0821e7ea7cff0…

MALICIOUS

PDF

80.9 KB Created: 2021-05-14 19:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ef68dcb73fd31e428b371e608e7d4b88 SHA-1: e482f02a51acfc0bfe1acac04c4742add740c0db SHA-256: 8de0821e7ea7cff04c91c9686571056050bb5634f7e68be0d9ade86f4444a1b2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://lozipotod.ru/strik?utm_term=fodmap+list+of+foods+pdf PDF link annotation
    • https://vonulimuwudepaf.weebly.com/uploads/1/3/4/1/134131723/natofamokowegal.pdfIn PDF document text
    • https://vipegiwofavagob.weebly.com/uploads/1/3/5/3/135302795/7252091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499942/normal_604eda9c4a4c7.pdfIn PDF document text
    • https://ruzoriro.weebly.com/uploads/1/3/5/9/135975417/tugogilid.pdfIn PDF document text
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/ac348353.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496607/normal_603413df2edaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485005/normal_605a105146d02.pdfIn PDF document text
    • http://dutebolidetol.iblogger.org/91925483008.pdfIn PDF document text
    • http://rexirututesopew.iblogger.org/vocabulary_words_for_grade_1_worksheets.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/298ea5b4d09a6.pdfIn PDF document text
    • http://ruxuruweluwi.iblogger.org/how_to_make_a_frequency_distribution_table_in_excel.pdfIn PDF document text
    • https://bejobaxugifupe.weebly.com/uploads/1/3/4/6/134628864/32021c30c6.pdfIn PDF document text
    • https://setibadumizokeg.weebly.com/uploads/1/3/4/8/134880372/d273c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371020/normal_5ff6729960d92.pdfIn PDF document text
    • https://xodimazu.weebly.com/uploads/1/3/1/4/131408168/liwerur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zilokujidetomo.epizy.com/angna_padharo_maharani_dj_ringtone.pdfIn PDF document text
    • http://suwiwomuve.rf.gd/45409834201.pdfIn PDF document text
    • http://jilatunotefen.rf.gd/6036701720.pdfIn PDF document text
    • http://vezenupu.epizy.com/benefits_of_technology_in_business.pdfIn PDF document text
    • http://sevapomelif.rf.gd/how_much_oil_does_a_10_hp_tecumseh_engine.pdfIn PDF document text
    • http://lozufifeme.epizy.com/99162234161.pdfIn PDF document text
    • http://nabiderafiwo.epizy.com/pofapalasibexowod.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_off0000fecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECC 5044 bytes
SHA-256: b4b38ceb00272a66bd0c844a5c9cea2f774e8dc276d0ea29667ee0044a917752
font_01_sfnt_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 10836 bytes
SHA-256: 56e236fc65887f6b12fb1b0242a5192cfdadd221fc561bb8dd6b6abc4fdf6c67

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