Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8bee68bce244fe…

MALICIOUS

PDF

75.8 KB Created: 2021-04-30 19:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d23bcd3ffa8210ca4a2216be1e59e8f8 SHA-1: 21fdd60c3b5349590371f22ccd72d7d2a62f8be1 SHA-256: 3e8bee68bce244fef5d08cde59642f91d2b328a862ce9b37ac8c43506d3d11a5
136 Risk Score

Malware Insights

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

This PDF document contains a lure for a free download, which redirects to a phishing site. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL is a known redirector used in phishing campaigns, likely to deliver a malicious payload or phish for credentials.

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
  • 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://leonvi.ru/strik?utm_term=1-100+number+chart+printable PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368979/normal_5fecce3a40c2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412895/normal_5fd79c2f0d186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465394/normal_6069784e64f5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417212/normal_6021843f6e0c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367911/normal_5fc9ac7e8ac09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466664/normal_6063690f0ac54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406455/normal_60069f6b3b348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495241/normal_6044e6e50b4ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450733/normal_6064bcc007e74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/299700e6-fb44-4af1-a954-9483ee528f68/9338404636.pdfIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_3c34354b11184a5cbe4011eefedf38ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/other_income_in_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/godex_g500_barcode_printer_driver_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19caf3e6-4889-4096-9cd2-b07b4dac05fd/favexobat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d81e077f-6636-4fec-ac08-a1257dd25fbb/pamobibipabelunelatezomeb.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/calories_in_medium_caramel_mocha_iced_coffee_dunkin_donuts.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_3e9fd6c0e0944606817fd2a2eff69802.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mokixetat/18687974476.pdfIn PDF document text
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_bd08b20b3e484c16aa50e83014c5f414.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/chiari_malformation_and_syringomyelia_in_dogs.pdfIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_dc7c0659f8184acfb7808f2e180e9636.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7ca8ff1-b909-4f42-bbb1-5950b8eed1c9/us_army_logo_black_and_white.pdfIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_50f921dbfdc043f3925164bf1c7a4556.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_off0000e969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE969 5268 bytes
SHA-256: c89ced8c18be9996485e936c79cbc5ad4a03ec7e0471b889196c255e2c1e43e5
font_01_sfnt_off0000fb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 11564 bytes
SHA-256: 234dd0999425ff0673c09a27883f12de3f589d9ed92b2142ba4d54b853269337