Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea38af532e140901…

MALICIOUS

PDF

84.6 KB Created: 2021-03-31 21:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 79fe08dae3c944107a5b93c31299f4c4 SHA-1: b2526cd3f07a60e4b8762e9ab5d21417ed3b496b SHA-256: ea38af532e140901baee539711f7411fccce40f9e0ec88b4424e1f0d03afc182
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/wix?keyword=fast+track+rules+aiac PDF link annotation
    • http://repair-kompov.ru/background_check_includes_credit_report2s5c7.pdfIn PDF document text
    • http://nexipufogavajid.getenjoyment.net/cospaces_tutorial.pdfIn PDF document text
    • http://top-agent.ru/citizen_eco_drive_skyhawk_black_eagleuc97q.pdfIn PDF document text
    • http://raisinshub.club/65864606959jx90m.pdfIn PDF document text
    • http://hempmap.ru/lirawuloylc3c.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://fogafixajusel.rf.gd/below_her_mouth.pdfIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_f3ed309544b24cf29b436a07d6e8d55e.pdf?index=trueIn PDF document text
    • https://10bc5e17-7652-4c7e-9b43-999b3eb3b021.filesusr.com/ugd/5edc69_6eab3a2a18f941e19c1e7178b1f13c42.pdf?index=trueIn PDF document text
    • http://kewivawegimomu.epizy.com/78067005522.pdfIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_92256f63045246319d348aa7d54ab8de.pdf?index=trueIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_f09b55ff5a5641b2889442746d0fc16b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/metformin_sr_500_dose.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_5416a86158a442eb9c8e16e42f181b5c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/how_to_program_ur5u-8790l-twc.pdfIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_628c42bd539c474891f8fe8f889eef38.pdf?index=trueIn PDF document text
    • http://setanidagivupad.epizy.com/list_of_nouns_in_english.pdfIn PDF document text
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_7b7378d0dae944f0ae5a83acac331b7c.pdf?index=trueIn PDF document text
    • http://jazopizebe.atwebpages.com/15742197041.pdfIn PDF document text
    • https://66f9544f-8325-470d-a543-c07714603334.filesusr.com/ugd/4b2642_f57c9b7eaf104695b894fe9526523b39.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_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 4476 bytes
SHA-256: 6f45aae112a41ff4f9b54b0d497e14109a670a578afdcf9ce89744eee2ab68dd
font_01_sfnt_off0001110a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110A 11200 bytes
SHA-256: a2c716319c46cbb79036462f497d17067ecea64d6aefff7749b1e32758140b55
font_02_sfnt_off00013750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13750 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333