Malicious PDF — malware analysis report

Static analysis result for SHA-256 023849f33f177512…

MALICIOUS

PDF

84.6 KB Created: 2021-05-13 02:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 311f14e712b6880516a7a8985138777a SHA-1: 67423a42aadfbf0b6f1a30dbe419c728edc309ef SHA-256: 023849f33f177512682a0ff87d3b3be54e7faa3f88136382630591a449956a03
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/strik?utm_term=garmin+zumo+660+for+sale+south+africa PDF link annotation
    • https://kewatedodi.weebly.com/uploads/1/3/0/7/130776291/4892433.pdfIn PDF document text
    • https://bipipabogudas.weebly.com/uploads/1/3/1/1/131164499/vidovegilu-leguxi-wagix.pdfIn PDF document text
    • https://fojowixejomad.weebly.com/uploads/1/3/2/6/132681658/8066e32b288.pdfIn PDF document text
    • http://goldotzyv.ru/good_olympic_weightlifting_bar42948.pdfIn PDF document text
    • http://skidki-day.store/19322924327tnepl.pdfIn PDF document text
    • http://goodsun.fun/81003784125zqv1j.pdfIn PDF document text
    • https://lisebozaran.weebly.com/uploads/1/3/4/6/134694889/lakibidomipema-ramaxogokino-bowuwokit.pdfIn PDF document text
    • http://phtech.site/2010_camaro_ss6gixk.pdfIn PDF document text
    • http://nejeninorus.22web.org/rafaruma.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/eihbeBJ/how_to_make_a_mask_without_sewing_cdc.pdfIn PDF document text
    • https://cdn.sqhk.co/terupilenu/kMhjBb2/29072160687.pdfIn PDF document text
    • https://pesadosopovito.weebly.com/uploads/1/3/4/2/134235692/d0e8b996e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zadobimad.epizy.com/what_questions_will_i_be_asked_in_a_warehouse_interview.pdfIn PDF document text
    • https://5ec50ee2-6c76-415b-b731-82d7de26534b.filesusr.com/ugd/826e74_05c9e8aa432c4b6f86b727f95969aa04.pdf?index=trueIn PDF document text
    • http://setiwifuv.rf.gd/past_simple_regular_verbs_exercises_with_answers.pdfIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_ba704feeaf81400eb17ac4f135152a21.pdf?index=trueIn PDF document text
    • http://baloxes.epizy.com/sovinuselumitanukoxobote.pdfIn PDF document text
    • http://labazuneg.epizy.com/prepositions_of_place_worksheet_for_kindergarten.pdfIn PDF document text
    • http://tetuzufolotozop.epizy.com/nukokudovovuvopere.pdfIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_b9888abe71874ba6a78af7a26e5db1fb.pdf?index=trueIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_b185af93f0764963a2226ed3f0a715c3.pdf?index=trueIn PDF document text
    • http://zetesapoxus.epizy.com/bibujisutipigepugaw.pdfIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_0378708c40e04aa7aa0528bfe3ec4bd5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1B 5380 bytes
SHA-256: b709549b4d0f36ff066dce24fd9d348eb9541e8f44736f6312d9ca435024600f
font_01_sfnt_off00010e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3C 12108 bytes
SHA-256: 107de4e8c82c842337cdf666e1df2eaa58949db3fe7777f20c14c832f1fff2a2
font_02_sfnt_off00013689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13689 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e