Malicious PDF — malware analysis report

Static analysis result for SHA-256 22482f7c57760222…

MALICIOUS

PDF

71.3 KB Created: 2021-03-25 09:15:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f8e796834c90ba862de129924909dcf SHA-1: e9483c8f50515024804b7fb127b45743e298d572 SHA-256: 22482f7c577602226a6a6f55a5f2c2c7518106d4f1d07937e2cb3ba16dacff82
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection mechanism. The document body, though partially corrupted, references 'how to replace a bryant furnace filter', a common lure for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 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.
  • 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://dafemum.ru/strik?utm_term=how+to+replace+a+bryant+furnace+filter
    • http://kernig.store/rotometixejulejobeton03v3x.pdf
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/2ba6360db3e.pdf
    • http://pifemukopisare.sportsontheweb.net/dave_ramsey_book_total_money_makeover.pdf
    • http://vovality.club/junowukibcd6s.pdf
    • http://chelobaka.space/autocad_software_free_download_2019b5jao.pdf
    • http://mitutepoka.medianewsonline.com/el_diario_de_greg_libros_similares.pdf
    • https://sugokumorol.weebly.com/uploads/1/3/1/4/131437576/xuvawa.pdf
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/22e891a.pdf
    • https://wiwanozamo.weebly.com/uploads/1/3/4/3/134306351/3de5761bedac53.pdf
    • https://bigimenuxorotel.weebly.com/uploads/1/3/4/6/134655509/bonegosudizuxop_jadiseze_gesifivuzase.pdf
    • http://orbitan.fun/vuzewor8pl5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wolobugoxew.myartsonline.com/73871905600.pdf
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_23cf8379438441ebb9278c925d31185b.pdf?index=true
    • https://s3.amazonaws.com/besafefaf/sojiponakopefowu.pdf
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_2182bc426efd43a3b1de19d64f487c89.pdf?index=true
    • http://nuwadolonopip.onlinewebshop.net/pimupizozudu.pdf
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_1588a5818a6a46a6b3828e14fcf524d0.pdf?index=true
    • https://f79c4d19-9b07-4ca9-ba82-4f938217db57.filesusr.com/ugd/c0d3e8_ffe0b228510d4a74b868178258e03207.pdf?index=true
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_1065b98496d84636b09b3269cc6d4f27.pdf?index=true
    • https://04fc2a56-3ca8-4b90-bfe8-b05f9e7ed3d8.filesusr.com/ugd/51e9d0_1cdfd7358f4c469e8e79296bb5eb6587.pdf?index=true
    • https://s3.amazonaws.com/setigafat/20610173936.pdf
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_b23cd90c52ec4008b2992239928d7619.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c4.bin
1970e71a42ecfe33a64c818abacc6c1c56f7b0c14665d6f91c732403fcbbbfe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 5124 bytes
font_01_sfnt_off0000ea57.bin
5b9310d6134f465e0b03db0a3bcd1517456c5bd6f75fd727e2964127ed8dbf98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 10912 bytes

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