Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2936f990c44e227…

MALICIOUS

PDF

74.9 KB Created: 2021-04-08 05:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7082ba45e09651fe1d884906765e99d7 SHA-1: d47e11a5558b199b4b6d0655cb9963a2387c5d81 SHA-256: a2936f990c44e22749f1e9c7cf4e997682f52d846e909bc1fadd06bd516ac696
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm designed for SEO manipulation. The document body, though heavily obfuscated, contains text related to 'Psoriasis guidelines usa', suggesting a lure to attract users interested in health information. The presence of ClamAV and ML heuristic firings, along with multiple unknown reputation URLs, strongly indicates malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://soxebez.ru/123?utm_term=psoriasis+guidelines+usa PDF link annotation
    • http://famozosivupiwij.sportsontheweb.net/baby_einstein_jumperoo_age_limit.pdfIn PDF document text
    • https://kexazupaxi.weebly.com/uploads/1/3/3/9/133997339/788b68a.pdfIn PDF document text
    • https://daxodewime.weebly.com/uploads/1/3/1/3/131398188/13b98.pdfIn PDF document text
    • https://kuxadolawemigos.weebly.com/uploads/1/3/4/7/134712866/ea9a7fce6b10.pdfIn PDF document text
    • http://crubr.space/dota_underlords_newbie_guidetemge.pdfIn PDF document text
    • https://litepuvib.weebly.com/uploads/1/3/4/7/134741427/fovubelatafu_wigajam_wigiv_madumamasupeg.pdfIn PDF document text
    • http://lnstagram-badge-verification.com/venojazanozenafi35j5t.pdfIn PDF document text
    • http://izzzaaa.space/wevavolum51vk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_b84bb972a39b4c73aa6263b08565ef18.pdf?index=trueIn PDF document text
    • http://vumamuv.myartsonline.com/44184473075.pdfIn PDF document text
    • https://19eae752-0dc2-40b2-988a-3ead9c543f91.filesusr.com/ugd/dee0a8_3ecd5045853d4c839a0e63342720ca4d.pdf?index=trueIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_6f451d0c0c08498faa4908438bbb28a5.pdf?index=trueIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_cdfdba09f49849fe88f266387ac790ef.pdf?index=trueIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_4a6a884b6a124e0db4900673fdc3a7f4.pdf?index=trueIn PDF document text
    • https://d7b50aa0-fea3-4edc-ba9e-4ed0094b0c60.filesusr.com/ugd/7f614e_04b42aa98a6640508217afadb8df3d52.pdf?index=trueIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_ea87111fd98946169aaf39013391c3e9.pdf?index=trueIn PDF document text
    • http://wudemexa.myartsonline.com/delixurodures.pdfIn PDF document text
    • http://nujugeteteda.myartsonline.com/fewebiwojufizunudasi.pdfIn PDF document text
    • https://f78a7b13-e75c-4ddc-9f3c-03cd83736f6c.filesusr.com/ugd/90c53f_1b422d29832e4c358e88f1dd6a5e9e86.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_d1392c8d3f264ebf97da3fb1a50625a0.pdf?index=trueIn PDF document text
    • http://nivuzujanux.myartsonline.com/44153913278.pdfIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_0a05e53cfd9445578c4cdd1f710ab40b.pdf?index=trueIn PDF document text
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_f36e33818393439c8e8163923cb85e3f.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_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 4996 bytes
SHA-256: 0a4fdb424e3e8305ec3e667a2ef4ec7b3c801407b93994cbccbf0deb5ef94a4c
font_01_sfnt_off0000f9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 10864 bytes
SHA-256: 5e3b459e12b9a5838478ac1f83b514ecfb340cefca6f304b224a0f792c5d15ad

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