Malicious PDF — malware analysis report

Static analysis result for SHA-256 6167866a613a5d25…

MALICIOUS

PDF

79.2 KB Created: 2021-03-08 20:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4788d0ed9665717dc88197b23fd36eb7 SHA-1: 241eefac878a068411769d4a50d0492a4b8240d7 SHA-256: 6167866a613a5d25479baebabf8a5643f3feb2e646fc5f9a16b695a7051bbc88
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to unknown or potentially malicious domains, indicating a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, suggesting the document is designed to host many links on disposable hosting. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

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
  • 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://vilenefex.ru/aws?utm_term=i+love+my+books+images PDF link annotation
    • http://smartcreditcheck.info/46860906497am9do.pdfIn PDF document text
    • http://fumatiw.mypressonline.com/aws_interview_questions_and_answers_for_devops.pdfIn PDF document text
    • https://jesipawuba.weebly.com/uploads/1/3/0/8/130874316/dexogijorolunoviw.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/volamutemorug.pdfIn PDF document text
    • http://leoidet.xyz/sotitedabopolaxunosesonefo839q.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/jabejesutetanopinanagovem4v6fj.pdfIn PDF document text
    • http://teenagetutor.online/barbarian_primal_path_5e1gkfs.pdfIn PDF document text
    • https://solujasamaro.weebly.com/uploads/1/3/4/6/134695729/laxekubodukususutuli.pdfIn PDF document text
    • http://alfa-quest.ru/disney_piano_sheet_music_easy_free9hwh7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_d9672a8da7214a24aaf4d622b5e1884d.pdf?index=trueIn PDF document text
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_62cbbcec19c846a5a28a76c40c82b893.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lanaladu/gallbladder_adenomyomatosis_guidelines.pdfIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_9b6a65d9576d4ffa85fca1887f5d6be7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/leributafa/lonulufimesi.pdfIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_d579e7f7e1da42b6912dabd76de6de09.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/wulawigiduluxat.pdfIn PDF document text
    • http://vawirir.atwebpages.com/seresisinudubator.pdfIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_b1b83bb3d3da4d55a0a39b970ca443c8.pdf?index=trueIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_fbf6c48fb1494763a08a371c37cab254.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 5212 bytes
SHA-256: c634dba02367027b3fc3e53172804aaf8ca8a8e6de2f26bb670bdfe01eb6086b
font_01_sfnt_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 10976 bytes
SHA-256: 09d27283f0c11b1b46e1a46d707f6ff6ce4df0acf5cbb0b275f08ae78a7bc66b
font_02_sfnt_off00011a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8E 16108 bytes
SHA-256: 40b4972c50c88d393489be5bde3d81a1619b37e5b87fab5a2fbd656868057354

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