Malicious PDF — malware analysis report

Static analysis result for SHA-256 b627053c725659a0…

MALICIOUS

PDF

77.7 KB Created: 2021-03-04 23:14:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 29bf7af66f5e2840486814469cf799ca SHA-1: 1358ecb14299a6a2572f06f3cc62d38961cdf665 SHA-256: b627053c725659a0fa21d027cabf619f60dc256de4f0e3c41cfec9dbbfb602f2
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one critical heuristic firing indicating a malicious redirector. Another critical heuristic identifies it as a PDF link farm. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or malicious redirection attempt. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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/123?utm_term=is+si-cl+polar+or+nonpolar In PDF document text
    • http://mx50off.info/how_long_to_store_lettuce_seedsueqt9.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/gobugupikizodajewuxptmj9.pdfIn PDF document text
    • http://idealslimitaly.site/3341879796fle0r.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/tuxenipup/73561625785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd494835-0d94-48e6-8fe8-cbd826538a58/rowobevevikez.pdfIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_3a2454121d614d649f812a71fe84c15b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/58726300557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb80eb05-b611-4096-9443-6767abc245a8/tecnicas_de_recoleccion_de_datos_en_investigacion_ejemplos.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/chrome_version_70.pdfIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_5285b06d49dc4f1391c427eacf5996cd.pdf?index=trueIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_2bab9a21b7504820b42bd8caf14c2e22.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dinilederu/kelington_group_berhad_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/63859906950.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/sexelazabovatol.pdfIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_1be896ce3182421ba6901d8553886087.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/funokanufiboxonu.pdfIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_49d654f6007d4504b173958cc4436051.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/bokerawipanajojozenela.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/bitdefender_removal_tool.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_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 4896 bytes
SHA-256: d1dabf174f929655dfb5c6a340080f38eb44df71a4b50f9c310a2f524db1be1b
font_01_sfnt_off000103ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EF 11264 bytes
SHA-256: 6dd4db3fded6c5fdb964b77595e0ef23f02d3f0b65907d7754eb0d8236c22a2f

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