Malicious PDF — malware analysis report

Static analysis result for SHA-256 356911e4ce1d9825…

MALICIOUS

PDF

68.2 KB Created: 2020-12-06 17:05:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e85993835b97a1a401f3abc10e65fda3 SHA-1: dc1e61a01e6ba94b4a69160ca1957303c32fb38f SHA-256: 356911e4ce1d98253fa7e65fdb1625814ad60bdf964aa60d46d0afeacb40fb08
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 0.9997

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/strik?utm_term=lump+sum+contract+advantages+and+disadvantages PDF link annotation
    • https://wadexusi.weebly.com/uploads/1/3/4/4/134440973/1610118.pdfIn PDF document text
    • https://dumunevebule.weebly.com/uploads/1/3/0/8/130874169/zasomimoxuxo_zunewutema_rivexopurikabo_sezoperefar.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/c9ad2742-fd40-444c-81df-8f035c28171d/vokobosuxadidoro.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/80903204232.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/88898828313.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/convert_to_word_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/xejonukigobudodo.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/adb_android_apk_install.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/xoruzasad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b95092-217a-45a0-afee-7965d8e0cea6/drifter_allegiance_quest_rewards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d26e4de-d9b1-4d53-ae50-fbde59b9dcfa/mojosedigofusiwed.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/physics_uniform_circular_motion_questions.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_off0000ce60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE60 5360 bytes
SHA-256: 75685e82d893ee82df1345eb8ac32573b8c1fbb8f5e6cc38ee766827dfdc4787
font_01_sfnt_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 10396 bytes
SHA-256: a7d21e7affd6354871adda8a85b7e70aa80e051d21b38b9758393f7efd15acab

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