Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc4a39d72c6058b…

MALICIOUS

PDF

80.5 KB Created: 2021-03-30 13:40:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8b8824f5fd3e279b2128811217239142 SHA-1: eb5c58b3204ef1c7cbe3a3201239dae834b97c2b SHA-256: 7fc4a39d72c6058bcc8f21cacbf441926b21cafe75683649a9b579ac2dd50dcc
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with at least one, 'https://ponafet.ru/123?utm_term=science+spot+forensics+answers', appearing to be a primary lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple external URIs points to a redirection or download mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/123?utm_term=science+spot+forensics+answers PDF link annotation
    • https://cdn.sqhk.co/dadakafopina/jghhhig/age_of_clash_of_clans.pdfIn PDF document text
    • https://xiforamuti.weebly.com/uploads/1/3/4/6/134611992/ad9bb8ff605.pdfIn PDF document text
    • https://cdn.sqhk.co/tatolodam/gcghigw/wadoxilegilajapivu.pdfIn PDF document text
    • https://watuwejaxor.weebly.com/uploads/1/3/4/4/134437052/wubefafiluzapewa.pdfIn PDF document text
    • https://lapolepep.weebly.com/uploads/1/3/1/4/131406498/basegagekaso.pdfIn PDF document text
    • https://lilofuzaxodas.weebly.com/uploads/1/3/0/7/130775659/ace779f7b085542.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buweweja.epizy.com/jusokemomifelugogev.pdfIn PDF document text
    • http://mutexuwe.epizy.com/kibefukexaxixomur.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/semavujujebo.pdfIn PDF document text
    • http://jogukazulani.epizy.com/como_ser_un_lider_efectivo.pdfIn PDF document text
    • http://bajejefi.epizy.com/samsung_un50ku6300f_wall_mount.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/xolirev.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_3b6f4679edc342cf8c89c3429beabb0d.pdf?index=trueIn PDF document text
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_de28090692fd49a6a93430c035c22607.pdf?index=trueIn PDF document text
    • http://gumavefuve.rf.gd/36943641152.pdfIn PDF document text
    • https://97e6e6c8-040d-427c-ad66-6ef02350ae38.filesusr.com/ugd/9c523c_9391a8b671194d3daa6aef733d2db41a.pdf?index=trueIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_315e81ad35b34019bd2cff4dbd828d54.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_off0000fe4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4F 5172 bytes
SHA-256: 33651edb7b746a739ab1a14a93afa4b796e3c28d062f836d65f67bec51a4bcaf
font_01_sfnt_off0001100d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100D 10796 bytes
SHA-256: 7ec4c18bce22c1719e16125a1c67dcbdc847ff399b3392507e5913dc78e53a4e

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