Malicious PDF — malware analysis report

Static analysis result for SHA-256 2737b86fc143b073…

MALICIOUS

PDF

75.5 KB Created: 2020-11-24 20:11:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fe4e4e5502a419dc2e76e4ee74a737f9 SHA-1: 1d7133f396cc9e97a1523a6dd2d3336bf7844817 SHA-256: 2737b86fc143b07305caf12da21ddb105b5b54f6c6bf24853fba3e39f303a947
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely for SEO manipulation or to distribute further malicious content. The presence of an embedded URL and the 'SE_URGENCY_LURE' heuristic suggest a phishing or scam attempt, aiming to trick the user into clicking the link by creating a sense of urgency.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffset.ru/123?utm_term=unit+8.4+study+guide+transcription+answer+key PDF link annotation
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/5026136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480878/normal_5fa6a760e610d.pdfIn PDF document text
    • https://lojedakefedo.weebly.com/uploads/1/3/4/7/134743006/e1e71114.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/0c321662-0101-48c7-9cc9-eb61d8d3ca67/guvegibazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ebcc149-987d-4822-9e71-9095bff67af4/watch_sherlock_holmes_2_movie_online.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/91945531672.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/area_of_composite_shapes_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64f231bc-5134-4fda-a987-f777e93d8097/76292020876.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/5337949349.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/classification_of_antibiotics_according_to_mechanism_of_action.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/bring_the_soul.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_off0000e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 5772 bytes
SHA-256: a71bc9367fb88a8f9034656c50ee026901013cdb9c940a019e8edd75d833c1b3
font_01_sfnt_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 10884 bytes
SHA-256: 9641e1444a7473ea3dd2bf64a51387f21039430e2276c5388df260296af4d5c8

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