Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c8fdd801bf617b…

MALICIOUS

PDF

65.7 KB Created: 2020-12-17 09:53:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9935d052bdca89025a25a5c93fd07226 SHA-1: d6649b0caa4dc78a8128097fd4f843a1f983ca67 SHA-256: 37c8fdd801bf617bb523d837c8de10051a2b147bfc02cf318cb854f113e57eb3
156 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 ClamAV and 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 0.9998

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
  • 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://traffnew.ru/123?utm_term=build+my+life+chords+pdf+e PDF link annotation
    • https://jawokisejul.weebly.com/uploads/1/3/4/6/134601468/8529992.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc3799d60f2895dc1f82192/t/5fc47de57acac6192a5100cf/1606712806101/nopotedixifez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b714ddcb-bbae-4113-ba45-04e238a8a2b9/kipowasividajosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28533253-f91e-4bce-b900-60253642842f/76997043567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dcb4034-8ba6-41ac-a929-017afe9139f7/69585588907.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5dc2688c99b6d37c954d5/t/5fd180b88ba64b78df4d0493/1607565497924/paintball_gear_walmart.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc575ad2bbd740658254770/t/5fd758705488895576c94738/1607948401363/64877223139.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc529855e8e827d42a99b3c/t/5fccdfc7d336b863f0c1e290/1607262151960/word_craze_level_724.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfceb2c14dfd36feeb11ef/t/5fc5babe3c02f22b9dd2eeed/1606793918140/dianetics_full_text.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcf012b058d4a6a57b972ae/t/5fd1fe635e090321cab81b40/1607597669365/89893496151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/169a0016-e7c5-4b9c-80b8-e44fcf134001/vugabulelegav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff5e400a-0d5c-445b-a3e0-f1f12d014bd6/12997423276.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b988a4d75e5252f68fd9/t/5fd1b7239a9e5443ac7974d5/1607579427514/luxatufeke.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc669b468612547ed83c202/t/5fcc82fd1e1a4d7de12422b6/1607238398375/machine_learning_cnc.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc508b027a199023acff9ea/t/5fc90f4ec05a90700778fa10/1607012174576/balzac_paris_discount_code.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_off0000c236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC236 5336 bytes
SHA-256: 5187be98d2f193d8f68e3fc1350b255f1fcbb21e5d70854fabee6a2573113c70
font_01_sfnt_off0000d447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD447 11236 bytes
SHA-256: fae75d11af8edca70a1d2812a3e2e91e6956817ec5060e92b6f3744ebfd3850b

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