Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f49b2e3bd7a09a7…

MALICIOUS

PDF

77.3 KB Created: 2021-04-06 05:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8839ba0ec8d773a3e60bb3d688affbb3 SHA-1: 5fffb93fec5be8678f114889617fa6c10bdc1af0 SHA-256: 8f49b2e3bd7a09a73a8e328e7783aff07a74f9af47c4c18c21c0ca3a7899cf33
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. One of the external URIs, 'https://druttle.ru/strik?utm_term=how+to+transfer+calls+on+a+avaya+phone', is directly referenced. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://druttle.ru/strik?utm_term=how+to+transfer+calls+on+a+avaya+phone PDF link annotation
    • http://fujubipe.22web.org/cardiac_cycle_and_heart_sounds_worksheet.pdfIn PDF document text
    • https://wosabawa.weebly.com/uploads/1/3/5/3/135390578/1871583.pdfIn PDF document text
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/364481.pdfIn PDF document text
    • https://pananufizusa.weebly.com/uploads/1/3/4/4/134445813/3792e9b0.pdfIn PDF document text
    • https://zugasemoz.weebly.com/uploads/1/3/4/5/134593751/936882.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/garmin_forerunner_410_strap_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/79972997937.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c81074b-9440-461b-bddf-234dba2b8627/2020_goal_sheet_printable.pdfIn PDF document text
    • http://fakefidefunes.rf.gd/rubepixeridupepowu.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/coordinate_geometry_formulas_class_11.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/beckett_baseball_july_2019.pdfIn PDF document text
    • http://dukodisedibuji.epizy.com/31768571543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b4c262-34ea-41e1-9aed-860494713d21/57623648042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fddd66c8-4f8e-4440-a5d7-af41ed912128/pathfinder_2e_adventure_paths_ranked.pdfIn PDF document text
    • http://gogagenuju.rf.gd/61087462128.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/65761038133.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 5316 bytes
SHA-256: dd6beb55d0edfd7e1b5df86df6d2b50ae48ef0210a0cec3db5d175b42b5934ec
font_01_sfnt_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 1936 bytes
SHA-256: 21a7146106e2ad29a4dcc6aa55cee169416400570e2b3d493b6d071cb256f2f3
font_02_sfnt_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 10956 bytes
SHA-256: 1eebd6638d19ba6fa3885f53bbd4dea4976c5dc96a6acf268f77e103ec460e72

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