Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c08dfb4339008f…

MALICIOUS

PDF

87.5 KB Created: 2021-04-02 08:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0f2bf426da56c9e5fd8338f46cf75dc2 SHA-1: b51dd2d9cfd236e8acfdc15dab1539cfa5bfd443 SHA-256: 31c08dfb4339008f3c0d8bf3f71917c157f69f14739fa1de5b42c5e5e08e43b1
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI and a heuristic firing indicating it's an SEO redirector for phishing, specifically a 'free-download' lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary IOC is the redirector URL used to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://midufefew.ru/award?keyword=boundaries+in+relationships+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/sevigexew/bZUmWnS/34171525175.pdfIn PDF document text
    • http://epipog.com/sodium_chloride_is_a_white_solid_physical_or_chemical_propertyb2ril.pdfIn PDF document text
    • http://kersita.space/gopakiponuwomokabze3p.pdfIn PDF document text
    • http://afracheat9.xyz/bemorutenenanaz895ta.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/zipazakafeguxefijid.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/e3tVjWW/53851053005.pdfIn PDF document text
    • http://vejuwetuk.mypressonline.com/totexuxazukeliguranapevo.pdfIn PDF document text
    • http://salestore.pro/1490321185l629t.pdfIn PDF document text
    • https://cdn.sqhk.co/kupawusel/8Pjd9UF/rewaluvegalazetomivuteg.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/roxizubevusujudumelavi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3275b6b9-3e75-4a59-beb6-377bb9316edc/autocad_3d_software_name.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/wuxisonenukenovufezik.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/hardy_weinberg_equation_pogil_answer_key.pdfIn PDF document text
    • http://sanojepenot.onlinewebshop.net/77469983011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa67e5e1-8b05-4bd9-a009-a83a0fe9941f/2010_camaro_ss_edelbrock_supercharger.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/gold_brick_guide_lego_marvel_superheroes.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/46859889695.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/human_embryonic_stem_cell_research_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/swiffer_wet_jet_mop.pdfIn PDF document text
    • http://wumafopid.onlinewebshop.net/annuity_immediate.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/tippmann_a5_air_stock.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 5216 bytes
SHA-256: eaba6f772f9150b2432f29e4ff269cc01a0e15a8abafab9e46835d6d24e9c1f9
font_01_sfnt_off00011d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2F 10996 bytes
SHA-256: e30dc96aef52a1ece35b00f6228734460ca0af796531942bf80e2971f22d5ff7
font_02_sfnt_off00014260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14260 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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