Malicious PDF — malware analysis report

Static analysis result for SHA-256 5870b6a4fa31549c…

MALICIOUS

PDF

73.4 KB Created: 2021-03-19 06:58:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 859cf9c93a8f99eea8c1d9085d58ad65 SHA-1: bb2c548fd0599b4670fd6fa034e8357978542d0d SHA-256: 5870b6a4fa31549c1049ea8fb10974fa8f2eeee2fa82b25c807b26b0fad80f2d
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to disposable hosting or known redirectors, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/wix?keyword=lil+wayne+lollipop+lyrics In PDF document text
    • https://zizudenavoxe.weebly.com/uploads/1/3/4/0/134017195/tanom.pdfIn PDF document text
    • https://zibubelufi.weebly.com/uploads/1/3/4/5/134517595/57ebcd.pdfIn PDF document text
    • http://nukotim.iblogger.org/82020955578.pdfIn PDF document text
    • https://zajedipadere.weebly.com/uploads/1/3/1/3/131398131/zixenipusov.pdfIn PDF document text
    • http://mobijogizex.22web.org/realidades_1_practice_workbook_answer_key.pdfIn PDF document text
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/9578174.pdfIn PDF document text
    • http://itgermany.net/43503973748zz7di.pdfIn PDF document text
    • http://fionainthefield.org/2009_dodge_challenger_srt8_performance_upgradesgugj1.pdfIn PDF document text
    • https://perepori.weebly.com/uploads/1/3/4/0/134016710/jumewofebonol.pdfIn PDF document text
    • https://jenazikefu.weebly.com/uploads/1/3/4/0/134017187/899c6.pdfIn PDF document text
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/1209074.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_e730fd3458554a108249d6b5a1f29881.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a8a7ce1-af97-4ea5-a49d-bcb6b47d0ce1/jupekogefasotonoguletap.pdfIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_9f8610d482bc4959b3a66309cff67c0b.pdf?index=trueIn PDF document text
    • http://runodeb.rf.gd/4971618399.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_101fd53eba37405ebff38b2c4d8246ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1522bc9-fc6f-44b6-85be-833b9887fff8/76680374923.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_8fba3172218c4946b35e596a79d1a3a7.pdf?index=trueIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_0bf39cf6799646858ebc73c5d539062d.pdf?index=trueIn 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_off0000e130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE130 5064 bytes
SHA-256: a12e22da0c6cc5098289deaa081e83a9730a363c4d955764ec44f35b5d5ac357
font_01_sfnt_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 11200 bytes
SHA-256: 7c3e5aa5496d78deb19fa6df87c8d629f1ba86768cdda184232811c3cb63dd43