Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaad4df3a7cc9049…

MALICIOUS

PDF

72.0 KB Created: 2021-04-28 07:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8e1875bf298fb79ba06511b4fbacb823 SHA-1: 2217429a73225ea4d545292c1c214f973bc91785 SHA-256: aaad4df3a7cc90493d506d7e9c7c83362f3e906b562f93a009c298d5323a2aa7
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded URLs, such as 'https://yafferge.ru/strik?utm_term=2002+honda+rancher+350+service+manual+pdf', suggest a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=2002+honda+rancher+350+service+manual+pdf In PDF document text
    • http://dfwshootersupply.com/calheta_beach_i_madeira_portugalp2u14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_5fd0bcedd3496.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446925/normal_5fe257b5cd44c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_5fd670d4ba7d6.pdfIn PDF document text
    • http://dnepr24.info/38833334469cwm8z.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/5haiggg/navneet_books_online_price.pdfIn PDF document text
    • http://konsalting.info/9264431515tz561.pdfIn PDF document text
    • http://ca-manalapan.space/327876858611ur40.pdfIn PDF document text
    • http://icily.xyz/org_chart_template_free_excelatokj.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/ghfhb8S/word_search_puzzles_printable.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365563/normal_60020b7fc00dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_5fd2ef153182e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458840/normal_5ffb865c9f5d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383687/normal_5fcf581f10e89.pdfIn PDF document text
    • https://cdn.sqhk.co/lowanivari/dibHTji/minecraft_bedwars_map_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375531/normal_5ff4daeb44c69.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/jdMIQa8/technology_in_higher_education_essay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384835/normal_606727baa1a0b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vipinib/jisozuvugawixedisadekur.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/sifobazaga.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/award_certificate_template_without_border.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/ruger_lcp_ii_22lr_10_round_magazine_2_pack.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/estrogen_receptor_reporter_assay.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_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 5924 bytes
SHA-256: bf249d1913b31d92b6040536a55324ea22610630ace6400dba82d95564b9c23f
font_01_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 10464 bytes
SHA-256: 89396574e752032f5bb1e1e080f5459e7bd8578dadc09d1ef0ada7195a6ac6da