Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea42c6019888e30…

MALICIOUS

PDF

85.4 KB Created: 2021-05-10 08:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5b19581ede116e20db3528f11ef5d405 SHA-1: d591f204a24cc384717af1b53cf647069e7e2a5c SHA-256: 8ea42c6019888e3066ce0e3ed19ebbc914589f8117894e82c890dc08cb60e441
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs point to various PDF files, likely intended to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=what+is+a+corporate+identity+system PDF link annotation
    • https://vanuseru.weebly.com/uploads/1/3/5/3/135350539/worub_fenewufarigefez_geteribefev_rirud.pdfIn PDF document text
    • https://lugilalosu.weebly.com/uploads/1/3/4/3/134314137/dojaxegidel.pdfIn PDF document text
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/ee0551.pdfIn PDF document text
    • https://zadukali.weebly.com/uploads/1/3/5/3/135340438/5352117.pdfIn PDF document text
    • https://vimugowome.weebly.com/uploads/1/3/4/3/134323071/budevepiripir.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/2918497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449187/normal_606e1676d53e1.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/sexitujabowujuk9c5x.pdfIn PDF document text
    • https://nitatodija.weebly.com/uploads/1/3/4/0/134012345/pudukenu.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/fulurinizixofal_kawatilediw_labavusewupo.pdfIn PDF document text
    • https://gufobetatogeset.weebly.com/uploads/1/3/1/0/131069923/tirewisepawoder.pdfIn PDF document text
    • https://fadafiwu.weebly.com/uploads/1/3/5/3/135302778/d443f6392f5a.pdfIn PDF document text
    • http://mx50off.pro/flow_3d_v11_free_downloadvgzbk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413987/normal_6017aedadb92f.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/330e92c6-6bc1-473b-b6ba-bc014b7b9ba4/britax_pavilion_70-g3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef04e69e-5bba-4f06-8005-48acfc49cd7e/fobebis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f3da1e7-9e29-4cfa-9aeb-98a357c085d8/gabiriwok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4015ef9e-0dd2-4fdc-8eab-dc0f759bdc63/charter_remote_setup_for_cable_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66784b47-4207-4d16-847a-185d0d3ff7dc/33210293893.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5B 5396 bytes
SHA-256: 0d32c43e6ea870c16399d8696d15ba306051e03f2d34fba66a576d00a1373bbe
font_01_sfnt_off0000fd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD96 2700 bytes
SHA-256: f23b418b2a34a2400d80e995ab779c6f7e23a2f60aa5d91c3425da69a22d2a95
font_02_sfnt_off00010918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10918 12924 bytes
SHA-256: 191ef425547918d249c37cbc5cc47e42f8527c2ee7f5fdd8066521a8fa7bad48
font_03_sfnt_off0001325c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325C 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd