Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21608929cb22042…

MALICIOUS

PDF

77.8 KB Created: 2021-04-02 00:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 33289273ebe83888fa4039884af5599f SHA-1: 588a92a396d0bac8d1b4d817e9626b22a45d6bef SHA-256: f21608929cb220424f8645aaaf50e8e91cecb22d0e8e73eab1abde8074fd27a6
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://vilenefex.ru/aws?utm_term=weed+eater+featherlite+xt200 PDF link annotation
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/vapusupaziru.pdfIn PDF document text
    • https://kezugefoluvero.weebly.com/uploads/1/3/1/8/131856244/poginojumisiguledux.pdfIn PDF document text
    • http://stebsmeh.space/16689119615kjdfy.pdfIn PDF document text
    • https://kivalake.weebly.com/uploads/1/3/4/8/134885121/votis.pdfIn PDF document text
    • http://upsbox.ru/lowulisogijefemzyy1.pdfIn PDF document text
    • http://espaceabonne.com/79897309467ti73u.pdfIn PDF document text
    • http://instapresent.site/archicad_18_tutorial_for_beginners43yjb.pdfIn PDF document text
    • https://lixobezabutefa.weebly.com/uploads/1/3/1/4/131406736/furenija_sezus_xafazapo.pdfIn PDF document text
    • https://guwuviwanawa.weebly.com/uploads/1/3/2/6/132695801/a9197f.pdfIn PDF document text
    • https://keminozabigorez.weebly.com/uploads/1/3/4/8/134886120/db8ee2a82.pdfIn PDF document text
    • http://cmbespaceclient.xyz/hal_leonard_classical_guitar_method32ptx.pdfIn PDF document text
    • http://nofixeb.iblogger.org/average_words_per_minute_typing_shorthand.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418167/normal_600be9fb48735.pdfIn PDF document text
    • http://nasevozowu.22web.org/adura_ololufe_free.pdfIn PDF document text
    • https://murovufusefafa.weebly.com/uploads/1/3/5/3/135331463/podasikagovib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450247/normal_6039ff2d80c77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476567/normal_604a3802ed467.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/epson_workforce_600_wifi_setupyvd9a.pdfIn PDF document text
    • http://sodalabs.pro/ryobi_410r_tillerqf247.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gepopimasirepav.rf.gd/vaxezezanef.pdfIn PDF document text
    • http://fapadosijavo.epizy.com/kijetusegavazelogopafe.pdfIn PDF document text
    • http://tosowepexinuf.epizy.com/film_animasi_anak_muslim_free.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_off0000f2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 5172 bytes
SHA-256: 5920c1b5e2fc687a5ef6177e7322368914782161806e58b1d58181fc3519d1fa
font_01_sfnt_off0001045b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 10628 bytes
SHA-256: 8dde4f0f00ae37b804e943b9206cc2dbe114757acaeb87c682fec943c3cfaa79