Malicious PDF — malware analysis report

Static analysis result for SHA-256 20213e2929b64a94…

MALICIOUS

PDF

88.1 KB Created: 2021-06-07 20:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d4c8ebb1b5c9c429667a4fa4e1074cce SHA-1: 13824d423dec16beda01ea1e8fba410aa30fd59b SHA-256: 20213e2929b64a9436f89d7cc5d181d86c775ca1ddd2070bc21bb15d416dcb74
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, and also detected by ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One of the embedded URLs, 'https://crewmak.ru/pbw?utm_term=what+is+a+tico+nail', is likely part of this scheme. No scripts were extracted, but the PDF structure itself facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://crewmak.ru/pbw?utm_term=what+is+a+tico+nail PDF link annotation
    • https://sofakixejiz.weebly.com/uploads/1/3/4/2/134265497/6342408.pdfIn PDF document text
    • https://vuzigalami.weebly.com/uploads/1/3/5/9/135960382/gufevitimuwodemewiso.pdfIn PDF document text
    • https://jugozufenuw.weebly.com/uploads/1/3/4/2/134266135/c1e1aca.pdfIn PDF document text
    • https://vixififevi.weebly.com/uploads/1/3/5/3/135346472/46ac90.pdfIn PDF document text
    • https://rizenorugeworo.weebly.com/uploads/1/3/4/3/134379336/35c92136e1f.pdfIn PDF document text
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/dca7a1d.pdfIn PDF document text
    • https://ketesepirexutub.weebly.com/uploads/1/3/5/3/135306065/08d05.pdfIn PDF document text
    • https://bixevojug.weebly.com/uploads/1/3/0/7/130739122/2120799.pdfIn PDF document text
    • https://xedatuvigino.weebly.com/uploads/1/3/4/5/134580066/d87649b21.pdfIn PDF document text
    • https://lifadupelede.weebly.com/uploads/1/3/5/4/135401245/7591104.pdfIn PDF document text
    • https://mulidugegobivim.weebly.com/uploads/1/3/4/3/134318636/8715723.pdfIn PDF document text
    • https://derewoju.weebly.com/uploads/1/3/4/3/134319287/680b40.pdfIn PDF document text
    • https://feresaxeto.weebly.com/uploads/1/3/4/6/134609658/ebc049.pdfIn PDF document text
    • https://dobuxodujunov.weebly.com/uploads/1/3/2/7/132741154/2c46c97eb8d8cb6.pdfIn PDF document text
    • https://kudojazejugir.weebly.com/uploads/1/3/4/3/134322101/gakurowuk_wovewudapededag_kupeketinafi.pdfIn PDF document text
    • https://relujebaxarun.weebly.com/uploads/1/3/1/1/131164257/gumedafivavosul_luwuzexasabegi_bilenupajo_mivime.pdfIn PDF document text
    • https://fakodide.weebly.com/uploads/1/3/0/8/130874451/murerag_kuletot_nujowe.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/e73a818b-2645-4b08-92bc-0364df28e2cf/how_to_apply_for_unisa_nsfas.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/w/file/fetch/144534357/7596011046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a80814-8e73-4380-ae5e-34be0fd35b3e/legetad.pdfIn PDF document text
    • http://xuladejuzor.pbworks.com/f/como_pagar_boleto_pelo_picpay.pdfIn PDF document text
    • http://vinivat.pbworks.com/f/gigabit_off_road_apk_hack.pdfIn PDF document text
    • http://zixereves.pbworks.com/f/2749434373.pdfIn PDF document text
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144631218/krause__becker_airless_paint_sprayer_kit_parts.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 4804 bytes
SHA-256: 3767a3104702f365d58e78a018e3cbcb5f666dbf52f08f1b2c663ab5b65bb9ed
font_01_sfnt_off00011623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11623 11640 bytes
SHA-256: 0807bbbe80a2d0f786e403ba9a85d127cdaa3543f70875490e5716b663e404a2
font_02_sfnt_off00013e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E01 16060 bytes
SHA-256: 503f5200e83b189a546b6c6e1d808633a9135186956fe76ff9bd78de3d91e3c6

Open this report in the interactive analyzer, or submit your own file for analysis.