Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d77bd0d12ecd902…

MALICIOUS

PDF

76.4 KB Created: 2020-11-17 14:37:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 081ffb1e2a84ba8472c624e3f22a64a5 SHA-1: d74d0d7da8c08b3c401f4f5868205e99e52c6314 SHA-256: 4d77bd0d12ecd90256dc413cfaaf847d12f9b0831ec317e7cee31477de7c927e
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 0.9996

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
  • 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://traffine.ru/aws?utm_term=ikea+hemnes+day+bed+sheets PDF link annotation
    • https://fibimijisu.weebly.com/uploads/1/3/4/4/134461798/narariwog-nofonurub-gifojutazux.pdfIn PDF document text
    • https://nidixinaxob.weebly.com/uploads/1/3/0/7/130739699/a3fb7b8489d00a0.pdfIn PDF document text
    • https://kekulewu.weebly.com/uploads/1/3/4/3/134398637/d76174520c.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/23ff39e1-0591-42ba-ae11-48bec1a66391/83294611188.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/codycross_answers_group_347.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/xuzafaweviwonow.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/shazam_apkpure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d34b9314-a071-4fa4-9e4c-2f260fcf6de4/labejesuretodow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9478e37a-02be-4eaa-9c8f-1f995743ad07/tetajixerotonasikat.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/fusope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/743c0bc5-3ce7-4d0f-be88-a3ce856abe23/sleep8_cpap_sanitizing_companion_sys.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44da8534-7259-49de-b9ee-c619f9e00c28/80499023920.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/advertising_campaigns_workbook.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA27 4812 bytes
SHA-256: 71956902ef05effd30ddb7f4bfd1560a96375286302936d3b6a81620a523f88f
font_01_sfnt_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 10476 bytes
SHA-256: 44f980c6ebaa7fa65eb93ce0a86a1d297cf828ecb8ba83bec8dd2ecb20fb9618
font_02_sfnt_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 17192 bytes
SHA-256: 912e3c8dd5d22db7f0e16d519bac2802439bdd609fc19c1ae8ae27c2db40966c
font_03_sfnt_off0001167e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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