Malicious PDF — malware analysis report

Static analysis result for SHA-256 815c92b87df9fdde…

MALICIOUS

PDF

88.1 KB Created: 2021-04-01 13:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bf5e579ad33a34f4586215845cab389f SHA-1: 951e2601eb07b21d439f4fe7467bad5b0b2e8da4 SHA-256: 815c92b87df9fdde0c3d3a4de2456fb46c9f6669d79270ab7ccc7863beab5e68
186 Risk Score

Malware Insights

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

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 0.9997

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://resalured.ru/wix?keyword=download+apk+csr+racing+2 PDF link annotation
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/e11ec95.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/kosizukexiweguro.pdfIn PDF document text
    • https://kezunegewekal.weebly.com/uploads/1/3/1/4/131483031/8e62e11e74.pdfIn PDF document text
    • https://lozuninusagutog.weebly.com/uploads/1/3/5/3/135309735/90bc2b89.pdfIn PDF document text
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/gonerepe-gujowusevamulud-lamugelepa-lizefizer.pdfIn PDF document text
    • http://tafiwon.mywebcommunity.org/cracker_barrel_menu_nutrition.pdfIn PDF document text
    • https://sakaromef.weebly.com/uploads/1/3/4/5/134507496/xalilabiligufo.pdfIn PDF document text
    • https://rofekituluz.weebly.com/uploads/1/3/2/3/132303072/35aae64a4d4.pdfIn PDF document text
    • https://menedufigejit.weebly.com/uploads/1/3/1/4/131482930/banusepevegokepoziv.pdfIn PDF document text
    • https://zifofuxe.weebly.com/uploads/1/3/5/3/135386801/nuker.pdfIn PDF document text
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/8767530.pdfIn PDF document text
    • https://fuzipoxo.weebly.com/uploads/1/3/0/8/130873840/zujusorekelolov-ropole-rigirixu-buwigela.pdfIn PDF document text
    • http://govuxojikasumot.scienceontheweb.net/farm_and_wild_animals_worksheet.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/5590b7fd-5787-4797-b095-6436e5264815/2005_6.0_powerstroke_manual_transmission.pdfIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_746f94aae01649a8a0f9265bf13ca3d8.pdf?index=trueIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_ac852e748a9b4a0e889b2a8d7542199c.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_41e81bb366884870b71370adcf8ac864.pdf?index=trueIn PDF document text
    • https://4bdeaa70-5336-4456-9086-62b410dce254.filesusr.com/ugd/f9d4cd_162712db619f4f6d8eb04ac76d71bea9.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_c2ded122eb844f31a7056f5099863b4a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75c5ccfd-376d-4608-b890-557fba4ac27b/bijotebanufivedoko.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_off000102f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 5528 bytes
SHA-256: b88576d9751e1f98a6bf4917027e9f10f9e5f4bc5698be025503bc886f121e3d
font_01_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 11900 bytes
SHA-256: 344f4f1805e798d2ada1f27490ac3f16fb152086e9a3b7a00953b1b8e908a83a
font_02_sfnt_off00013c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6A 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd