Malicious PDF — malware analysis report

Static analysis result for SHA-256 0351efd28a0c4c4d…

MALICIOUS

PDF

84.6 KB Created: 2021-03-16 11:29:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 064b7a6dbe9065c934cf53c3aaa3e48c SHA-1: 1ba4745a547a0c9fe2b70f9c302f27b79c700fa4 SHA-256: 0351efd28a0c4c4d7dc76072c5b1c00ac07416f4ae002aae691158d69cfcb54e
186 Risk Score

Malware Insights

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

This 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 it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/wix?keyword=metodo+de+tanteo+pasos PDF link annotation
    • https://cdn.sqhk.co/bajipugotox/iihexCN/51180697835.pdfIn PDF document text
    • http://lozuzaragujeb.mypressonline.com/52834425012.pdfIn PDF document text
    • https://cdn.sqhk.co/wareberefiz/gj9iggh/happy_room_log.pdfIn PDF document text
    • http://pemotutafid.mywebcommunity.org/8420713395.pdfIn PDF document text
    • https://luwanolukurodo.weebly.com/uploads/1/3/5/3/135397368/8727832.pdfIn PDF document text
    • https://cdn.sqhk.co/putomikoluku/lw3IOR1/endocytosis_and_exocytosis_are_both_forms_of.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/geKjfAO/cartoon_wars_part_2_script.pdfIn PDF document text
    • https://gofadoden.weebly.com/uploads/1/3/4/6/134615513/d43e3bbc4b2fc6.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/ghafGzy/rjr_jamaica_radio_fm.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/hjhjumr/41145493421.pdfIn PDF document text
    • https://cdn.sqhk.co/jatobeguji/9idrhiS/nozida.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/iBgcRgd/kuvugaxubidarafubanabim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/liwafo/jegomipupewudifoxipebel.pdfIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_1f8e72cd6aca4a2f85f7374cf896e6a4.pdf?index=trueIn PDF document text
    • http://zipemoluligera.myartsonline.com/39582366135.pdfIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_aa925c1db2c9498a8f442fd98fdf6898.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/business_information_systems_ireland.pdfIn PDF document text
    • https://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_b57f6a45907b42359706390589c618f9.pdf?index=trueIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_76c3d388747040c38688acb635aff530.pdf?index=trueIn PDF document text
    • http://nivuzujanux.myartsonline.com/jotijumarepopelituwagoko.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/33757562316.pdfIn PDF document text
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_c055efc8f11c4585ae8bd4158f8e02da.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64C 4832 bytes
SHA-256: ec2191be67c8b948897f0530ef147e4ac27ef9a1752d32ab09f808f643fe9603
font_01_sfnt_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 11540 bytes
SHA-256: 0157470081e424c640e896dee0286407f68396048347883111b47d4b72944a39
font_02_sfnt_off00012c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9D 16484 bytes
SHA-256: f23cc52510223b6ad194a59ecee71e92186316492ee6b11b0321f14d423b9c23