Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76d24862ada3dfe…

MALICIOUS

PDF

76.0 KB Created: 2021-03-21 03:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3bb4af20afebaeb0b5a9d7248f2e42fc SHA-1: edb1276cce588f87ee18af2d0dbeb319d3544bed SHA-256: b76d24862ada3dfe73b37435f8915d5671f48f8cf1433ee92acb8b5b07dfe35c
194 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, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • 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://jacksth.ru/wix?keyword=costume+plot+template PDF link annotation
    • https://xobiduri.weebly.com/uploads/1/3/1/4/131437628/c2f0c73d9ef.pdfIn PDF document text
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/warubuw_sozofemoxojumi.pdfIn PDF document text
    • http://lewulumotuf.iblogger.org/nuxusifupoganezajaz.pdfIn PDF document text
    • https://nojesinas.weebly.com/uploads/1/3/0/9/130969722/xikidajudinug.pdfIn PDF document text
    • https://kunaxujo.weebly.com/uploads/1/3/1/4/131406864/direwemun.pdfIn PDF document text
    • https://balolenitazir.weebly.com/uploads/1/3/1/0/131071159/0c880387.pdfIn PDF document text
    • https://valezofijamope.weebly.com/uploads/1/3/4/4/134445284/xamokuzi_mekofamejanulav_gumido.pdfIn PDF document text
    • https://javudufopatoka.weebly.com/uploads/1/3/1/6/131606124/2798519.pdfIn PDF document text
    • https://fofawuparojimi.weebly.com/uploads/1/3/1/0/131070926/d9194.pdfIn PDF document text
    • https://zafivagofe.weebly.com/uploads/1/3/6/0/136011523/130edd.pdfIn PDF document text
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/1757126.pdfIn PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/4521010.pdfIn PDF document text
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/muzemokovovujini.pdfIn PDF document text
    • https://xikuvisaduwobax.weebly.com/uploads/1/3/5/9/135962120/2005546.pdfIn PDF document text
    • https://wipukanutunuk.weebly.com/uploads/1/3/1/4/131437017/9469569.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baguselewaz.epizy.com/niketakalafirarufabusuwuz.pdfIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_4d8d5b5e58224e5f8054eca2cc586906.pdf?index=trueIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_2d2916416c034a1db4b734ed86f0d4db.pdf?index=trueIn PDF document text
    • http://sugizujesel.epizy.com/woganejiwimajowesipazibe.pdfIn PDF document text
    • http://nosekaj.epizy.com/assisted_e_aadhar_csc.pdfIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_9356569b6b204b13966c80520e818aef.pdf?index=trueIn PDF document text
    • http://lipesomidu.epizy.com/winubadid.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_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 4776 bytes
SHA-256: 015dda5dc2b74d8a4d7e0ecf6068dd2dfb4b2358ab6977ca0f748620eacd965b
font_01_sfnt_off0000ff57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF57 10348 bytes
SHA-256: 976d9eabba1cc4fb30ab468c974112531c4b215b0fe6740fa1a2cf34e67526f4