Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a083193eadc3b34…

MALICIOUS

PDF

84.2 KB Created: 2021-02-19 01:03:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cd76a18cbf4147bfdeb06e6e24acbb3b SHA-1: c0a8d8c093f8e532825cc9ad6cadd1a9d1e8b40b SHA-256: 8a083193eadc3b34d39c1acb6c2a7530d1969ea998059e48305065ab5373fb16
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to attract search engine traffic. The heuristic firings indicate that these links lead to malicious redirectors and that the PDF itself is classified as malicious phishing malware by ClamAV. The document body, though heavily obfuscated, contains text related to software downloads, suggesting a lure to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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/123?utm_term=serato+dj+pro+free+download+for+windows+7+32+bit In PDF document text
    • https://zerasogamonan.weebly.com/uploads/1/3/0/7/130775055/tedigevodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408333/normal_6019ac7f2b87b.pdfIn PDF document text
    • http://graatorama.space/97154132328czpwv.pdfIn PDF document text
    • http://esclick.pro/96978500207gcl6o.pdfIn PDF document text
    • http://tixshopclub.fun/artificial_insemination_processv5r99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470698/normal_600efb912742c.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/kghNhh8/vifebutusaramibulanid.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/eq4MAaO/dozajebudax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458150/normal_5fd7b93224908.pdfIn PDF document text
    • http://wiregabjuk.fun/reporting_unclaimed_property_in_puerto_ricoh5y8y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424029/normal_5fe0ef37d39be.pdfIn PDF document text
    • http://floradoma.net/optiplex_780_memory_capacitynj4ug.pdfIn PDF document text
    • http://bighome.space/kozejamafamoxixosijou4x.pdfIn PDF document text
    • http://radanews.site/nukukonezamokoxukizivixagn5hmk.pdfIn PDF document text
    • http://kemytbok.xyz/aristotle_onassis_biographyg8f3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458848/normal_5fe940b05f702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480753/normal_5feaf28e49474.pdfIn PDF document text
    • http://reduslimitalia.website/best_samsung_android_smartphone_under_20000kjw26.pdfIn PDF document text
    • https://cdn.sqhk.co/wowixepis/gihH9ie/island_survival_minecraft_modpack.pdfIn PDF document text
    • https://vawisopikev.weebly.com/uploads/1/3/2/7/132740649/wuzapedofizusumesid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 5820 bytes
SHA-256: ad54ac992c7da0835dd1a4deb1cffb4131e2058fb4506d6a225683df0d7bede7
font_01_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 15552 bytes
SHA-256: b81e1646ab2e8b5ef2fa9090cf8de850f96a8eda7e49d542976a9c6dc52ab1a1
font_02_sfnt_off00012dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDA 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf