Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f89fa77d986a08…

MALICIOUS

PDF

73.0 KB Created: 2021-06-06 01:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fee95fd6fb76c2870f9a5ab63e75bb87 SHA-1: 418f94487b6c422b78ac02a317f6eb23353199b0 SHA-256: d9f89fa77d986a08f4e712467a48881adfbe93ccbc04d2b2160875ab6e9e33f8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to direct users to potentially malicious or phishing sites. The embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://inwebjor.ru/pbw?utm_term=what+is+the+fundamental+difference+between+us+gaap+and+ifrs PDF link annotation
    • https://jitavemalidev.weebly.com/uploads/1/3/1/8/131871699/sogumawosokisafagiz.pdfIn PDF document text
    • https://kukegogefip.weebly.com/uploads/1/3/2/6/132681459/zaluxe.pdfIn PDF document text
    • https://midezotadodagof.weebly.com/uploads/1/3/5/3/135326840/sativepipepajow-bojileniw.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/dojenip_lapepiwepufit_xifomekujolixi_rujepogujoje.pdfIn PDF document text
    • https://tesudegijalel.weebly.com/uploads/1/3/1/4/131438759/1599256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_604d02dc4e77d.pdfIn PDF document text
    • https://verafilutawus.weebly.com/uploads/1/3/4/5/134597792/wuxikagev_waxew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469831/normal_6041236a25996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388422/normal_60435318a6139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474470/normal_602e4641bce2a.pdfIn PDF document text
    • https://wesudami.weebly.com/uploads/1/3/4/8/134881188/9824024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458852/normal_6014455bd31fb.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/rozuguzex-fibokexa-wevobuvomez-venaxibasofak.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/c8709290-1658-40af-8c65-ed3223f822c3/how_to_fix_capresso_burr_grinder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9a1ce5e-c138-4d1f-822b-d5f140163aff/26335889224.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/74137063052.pdfIn PDF document text
    • http://bavudexote.pbworks.com/f/ps3_emulator_for_android_offline_apk_download.pdfIn PDF document text
    • http://ravowibosu.pbworks.com/f/la_ilaha_anta_subhanaka_inni_kuntu_minaz-zalimin_meaning_in_hindi.pdfIn PDF document text
    • http://tiduxikuve.pbworks.com/f/kurosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80f94db2-374e-4cb0-a0ef-c0442c23b496/doligunivereliwefupafej.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_off0000de15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 5812 bytes
SHA-256: 5019e9cd458131fc16e2c9421a795294f0678ba7b5eeab9e61082d1e4ce93235
font_01_sfnt_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 10524 bytes
SHA-256: 8a8c781e28461088579d4a81353e2d30b5d58b7bd5b53d4bab2e3476708af19f