Malicious PDF — malware analysis report

Static analysis result for SHA-256 994c8fa2604db74e…

MALICIOUS

PDF

102.2 KB Created: 2021-03-14 11:08:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c100c584269b3fd71250b16ea1953bae SHA-1: 43ce0dc6d2c928f9d144aa1f6397c247296f8bc7 SHA-256: 994c8fa2604db74e7487ed9d9ef8c16f8c546c1e315a11cd2924adafae639d19
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

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.
  • 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://druttle.ru/award?keyword=boston+massacre+summary+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465257/normal_5ffc1750359f7.pdfIn PDF document text
    • https://xebuzoxovekig.weebly.com/uploads/1/3/4/0/134018553/3037369.pdfIn PDF document text
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/xokosez.pdfIn PDF document text
    • https://rewumakabaw.weebly.com/uploads/1/3/4/8/134856880/wobok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387814/normal_5fe02db1c86d2.pdfIn PDF document text
    • https://xatuguje.weebly.com/uploads/1/3/1/8/131856293/vivorojelezirawodud.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/jowepewukurud.pdfIn PDF document text
    • http://dipugipedanam.sportsontheweb.net/cyberpunk_red_jumpstart_kit_characters.pdfIn PDF document text
    • https://tiputanamadavok.weebly.com/uploads/1/3/5/3/135314880/korabemilas_nafigipetonagas.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/cd97a174-bcea-4b7e-83c6-55b94d299d83/kisufupugeromolafigigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ebfd9c-11b9-4373-94a3-a3131fedcfe7/how_to_become_a_bar_manager.pdfIn PDF document text
    • https://a7176590-a44a-43b4-8b25-1171fb6190ac.filesusr.com/ugd/e6ccb8_18287727c6ed41a88ed85657128afe01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/waxapoz/camtasia_2018_manual.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_19d7d6e8d3da4130a7cd19f19b6f5b3b.pdf?index=trueIn PDF document text
    • http://nakeviw.myartsonline.com/mizup.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/android_phone_under_10000_flipkart.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/32990360343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26924e6-b036-485c-ba85-8ee7953adad6/what_song_does_rose_sing_at_the_end_of_titanic.pdfIn PDF document text
    • http://kikanelomer.onlinewebshop.net/58878153786.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_off00015036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15036 5420 bytes
SHA-256: a0641c89ddd05a0ed1fa969d723cabb2bcc4822efe9e2ce3b0a8db83d6db0ead
font_01_sfnt_off00016294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16294 11660 bytes
SHA-256: c6234e399e7db531f39e528a214b2d46f7a8fae3c6a0339e3de7018b530d9b84

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