Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e219f0ac467be1c…

MALICIOUS

PDF

78.4 KB Created: 2021-04-04 07:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7c5a4f9eb5b3fdefcfe02cb1ff9050ac SHA-1: 770f11489503bcb4a89b92c4413ea9e1dbe24c63 SHA-256: 8e219f0ac467be1cb2408324cd36e1cbe792f479a863c1ae9ac734487f7cd641
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'Battlemaster fighter 5e maneuvers' and application metadata, likely serving as a lure to drive traffic to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=battlemaster+fighter+5e+maneuvers PDF link annotation
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/repugufizotaxom.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/sevevujaxiji-demujofoxepox-timefasoni.pdfIn PDF document text
    • https://pafetuvuwube.weebly.com/uploads/1/3/4/3/134321561/5770060.pdfIn PDF document text
    • https://mukoxawav.weebly.com/uploads/1/3/4/6/134627731/aecfce6.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/sovanali.pdfIn PDF document text
    • https://welirupew.weebly.com/uploads/1/3/4/6/134662060/eb2b00729d2b154.pdfIn PDF document text
    • https://wusoxebuwewete.weebly.com/uploads/1/3/4/4/134432123/1763785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408711/normal_603e4a1545f7e.pdfIn PDF document text
    • https://bivejeweki.weebly.com/uploads/1/3/4/3/134322338/nowirusesewupi.pdfIn PDF document text
    • https://zutegikovepob.weebly.com/uploads/1/3/4/0/134017150/6590cbc2e697.pdfIn PDF document text
    • https://dofonumid.weebly.com/uploads/1/3/5/3/135314870/sokunijopi_sagoxiwal_ruvar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_5fd78f5119e25.pdfIn PDF document text
    • https://vumimexuderuwaz.weebly.com/uploads/1/3/1/8/131871863/9660812.pdfIn PDF document text
    • https://vumukawa.weebly.com/uploads/1/3/4/6/134662430/186d8e628905.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c946a2b-5fc6-4b0c-9d72-f26f62ca3ae7/78337050595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48e484da-6816-40df-95d6-2dd5304d776d/how_to_calculate_income_approach_gdp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d96be1f0-f610-482b-80f9-c2a0ff3cdb25/fullstack_react_native_the_complete_guide_to_react_native_download.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/3443105120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5612ac31-3cd9-4dff-a8ab-290ccba8c0b3/z97_cpu_compatibility.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/simple_vimeo_er_chrome_extension.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28cbbbff-ab03-4f9d-bf9b-eb55be4c6622/what_degree_is_needed_for_a_public_administration.pdfIn 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_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 5416 bytes
SHA-256: dd67f343f52c9a5d8b29e8ffa15c100ceeac7be7e90f51964c06afc65531dafe
font_01_sfnt_off00010824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 10660 bytes
SHA-256: 9bb734683700461e800d165dfe48a0b0c015873bbc4593c1bdd0dd3e5ae0dec9