Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2ab7616fd5cd57…

MALICIOUS

PDF

73.1 KB Created: 2021-05-04 06:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 21fd02c5e96d8761fca9be82d97893bf SHA-1: f52f8537941ff9d15d473fab75a757c85d37972e SHA-256: db2ab7616fd5cd57abd00ba4ac69ee0bbff3b3cdfae9cb3c3a0d431ddd3b0bd1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious sites. The primary URL, 'https://ponafet.ru/strik?utm_term=how+to+use+cash+app+to+purchase+bitcoin', suggests a lure related to cryptocurrency transactions. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest an attempt to redirect users to phishing or scam content.

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 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://ponafet.ru/strik?utm_term=how+to+use+cash+app+to+purchase+bitcoin PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393754/normal_6012daa525d83.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/gho3iUA/can_hitting_a_curb_damage_tire.pdfIn PDF document text
    • http://fumexijana.getenjoyment.net/13536320712.pdfIn PDF document text
    • http://mokaxizekebade.scienceontheweb.net/41558946902.pdfIn PDF document text
    • https://cdn.sqhk.co/sadopore/Bjd3Gjc/61429362260.pdfIn PDF document text
    • http://gasolotiravizid.sportsontheweb.net/adaptive_cluster_sampling.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/cCzojhA/42841415886.pdfIn PDF document text
    • https://cdn.sqhk.co/xororasomig/gggeiev/gowakawizofubujem.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/kha9ajg/cafe_racer_jacket_mens.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379053/normal_5ffac92343e9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_601c7c9267e48.pdfIn PDF document text
    • https://cdn.sqhk.co/fiseguvugele/jhRrjgM/grass_cutting_shoes_with_spikes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_cd9abe5ddebd4824a092d72102b8259d.pdf?index=trueIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_bc3e7ae1e8f7480fb0b2b75c8e9750eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/management_of_septic_arthritis_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/double_digit_addition_worksheets_1st_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/c_c_red_alert_3_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/kenetrek_mountain_guide_boots.pdfIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_55571f06ba624df6ab3a35aa21c0329a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 5184 bytes
SHA-256: 43c20d9eb10fafa94475d57af6339b5ebf5db94090b31c3affea399425b4d60e
font_01_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 10964 bytes
SHA-256: 0f284c188f4e56174bf9c3bbb72bd9ed29280f1afaf266531439c76b9311230a

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