Malicious PDF — malware analysis report

Static analysis result for SHA-256 314c09c371f579cf…

MALICIOUS

PDF

73.6 KB Created: 2021-05-11 11:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 98335129cb9ff9b9dd6c5e9567ef23cd SHA-1: ec1f885cfa91aacd6a0310cd1048ebf442855851 SHA-256: 314c09c371f579cfb2868e7572c34e8207c0c572c2afdbbbf7e248216a7ebb78
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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.
  • 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://bologen.ru/strik?utm_term=dell+optiplex+9010+audio+drivers+windows+10 PDF link annotation
    • https://cdn.sqhk.co/kawurefeki/jfphj7S/25527042182.pdfIn PDF document text
    • https://cdn.sqhk.co/jijatidos/iijKicu/43719349025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391015/normal_604d19e413744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485016/normal_6066a455c78e6.pdfIn PDF document text
    • https://gomamuna.weebly.com/uploads/1/3/5/3/135304292/pudomesaderizip-nojexiseda-nubewawokegife-jomabosogezag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_603432d62cf36.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/UAfcjjT/98606800544.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/IghA2b9/gun_sound_effect_pistol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376866/normal_603becd752a6b.pdfIn PDF document text
    • https://kozikimonewuzo.weebly.com/uploads/1/3/4/5/134592445/pavufaka.pdfIn PDF document text
    • https://cdn.sqhk.co/zezofajanaf/Ghehh8x/sudatuniwaw.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/mubefula/vshare_for_ios_7._1._2.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/plant_cell_structure_and_function.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/arms_and_the_man_bernard_shaw.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/4308223568.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/gst_full_details_in_gujarati.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/2615810882.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/church_logo_psd_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/23532891700.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/25575855238.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/64584243416.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/lg_fuzzy_logic_washing_machine_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/artificial_insemination_in_goats.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/palixiregaxufesudebu.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_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 5524 bytes
SHA-256: c18ab3c19d3e516aaebdc86f0422b3ecd022ce1a337da8dd4baabcbd6fae6cea
font_01_sfnt_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 10444 bytes
SHA-256: 73e5ae6061add9cd9e805775938d83f2e24bcad0f59154cc08d91e9f29f8b164

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