Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ace87526aeb2497…

MALICIOUS

PDF

87.9 KB Created: 2021-03-18 00:06:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0680c98dcbb3fb7c8f34bdc5e13457c6 SHA-1: eeee1991ae9f4aea3852fd29932087ffc582c868 SHA-256: 4ace87526aeb249758a1d1744f93502ea5a70e7887be952d3f37f9344b5d16b6
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a strong intent to redirect users to potentially harmful sites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://midufefew.ru/wix?keyword=agile+physical+therapy+fremont PDF link annotation
    • http://usene.xyz/ximud7aj5m.pdfIn PDF document text
    • http://ru-1.casa/mubukadunulituzidetuxabekc1gbk.pdfIn PDF document text
    • http://keep-travel.com/tezeruvopigubefiloxymftw.pdfIn PDF document text
    • http://zeropium.com/sharepoint_2016_usage_reportsc55lc.pdfIn PDF document text
    • http://teagreen.space/wekuzepuvikofakemejo3hkvl.pdfIn PDF document text
    • http://s-tochka.ru/elementor_template_types287kv.pdfIn PDF document text
    • http://folutelegaraz.iblogger.org/gekuxegiforejujabozisu.pdfIn PDF document text
    • http://reduslim-shop.site/singer_6235_bobbin_winding0ba41.pdfIn PDF document text
    • http://ita-fitness.fun/guzezei4dqm.pdfIn PDF document text
    • http://persequen.com/madutotuxtbm02.pdfIn PDF document text
    • http://center-about.com/hyundai_elantra_2017_service_manual83k0l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bomiboduju.epizy.com/bams_syllabus_1st_year_download.pdfIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_9827fec1810446b6bf100b5a7c5eefd5.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_6c4accf0dc59459784925617868bae8d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/job_offer_letter_format.pdfIn PDF document text
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_c9eeb6a7366f4145a774ba16ee7e62b9.pdf?index=trueIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_6eac1d7a4fdc4c4fbfd03b07eddd2a85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/turip/bazujavune.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/69967012829.pdfIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_e0f7a7d5ca344e2497fd95af99b520ca.pdf?index=trueIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_70d5f46d253a4ba0b5b53a73c5bc4b7e.pdf?index=trueIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_64fb5425b9f04690b833be6b3aee635b.pdf?index=trueIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_5932c4b2d5ad4409b1e9de43e23fe982.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_off00011a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A54 5520 bytes
SHA-256: 23c59279e7a723904c96d9763e0af4f859f4357edad45cf0295034b144a795e5
font_01_sfnt_off00012d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D02 10768 bytes
SHA-256: 5369420be40bbb303f80186bb90d4ac9154391427ee6f08d40179ebbd70fc0d0

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