Malicious PDF — malware analysis report

Static analysis result for SHA-256 0193f4ec1bd83805…

MALICIOUS

PDF

76.7 KB Created: 2020-12-25 04:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6bd9cb32f69d90e322fb01117eda6f93 SHA-1: 94c84eb226bd1b572b5f426fc48f51eb91d67ce5 SHA-256: 0193f4ec1bd838050bbcdc69bc432a4ca3b8ce7102741bc48aabe0fb64d9d839
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://trafffe.ru/strik?utm_term=super+jabber+jump+2', is directly associated with the malicious classification. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/strik?utm_term=super+jabber+jump+2 PDF link annotation
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/4115277.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/asiaZji/56455652655.pdfIn PDF document text
    • https://cdn.sqhk.co/peretudiwi/Nq5jhjT/silicon_valley_season_6_episode_3_air_time.pdfIn PDF document text
    • https://cdn.sqhk.co/vemonososepa/YC5ifhd/71529102488.pdfIn PDF document text
    • https://cdn.sqhk.co/supetuzitepi/jjyjaie/32756061425.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/7578c667-b8b1-4aa9-ab51-d7d9959cfb3b/sodirozinizew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fec9a3c-c4db-47b1-8228-6898ee14e55e/texas_algebra_1_volume_1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86548b78-366b-41a5-8ab8-edcaacb4e658/87718408341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f363f065-8189-4b29-bb84-ae3392efad6e/27686747088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8345521a-ac26-4c89-8a40-33e70e0956f4/88267634327.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5891ab50-e5a6-448f-9b9c-41f80c759114/dead_by_daylight_bouygues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92d93abc-8c3e-41d2-8375-f01d90f310af/final_cut_pro_studio_7_serial_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/914c74ba-1f31-4ed6-b839-c16b8744d4e8/master_slave_contract.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c5c28c4-e20e-4b5c-b7db-432bebfcd15c/awesome_oscillator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41d1b040-ec42-4294-815a-9914115a193d/vetugezobovodanarex.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD395 5204 bytes
SHA-256: 5418fb006387d02c116863fd81a92b20c798e5fe6741f0c4ccbc8ecb47f63d8a
font_01_sfnt_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 14028 bytes
SHA-256: 0f09fc6a53cd780532ab5a23486c68f0732fb946e22f4d37db2dd1b588225b99
font_02_sfnt_off0001116d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116D 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1

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