Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35a56f0d0ca0b78…

MALICIOUS

PDF

85.9 KB Created: 2021-03-11 17:08:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d65d0d7c9bfd0888ba33f1cf07987e47 SHA-1: 9eae546f65cd4b3542cbf68d2b94cdf47e96ebab SHA-256: e35a56f0d0ca0b78aa19e202586681b4aef50defde64b97312938a3caf531700
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and are likely part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded links, such as 'https://leonvi.ru/award?keyword=bidayatul+mujtahid+urdu+pdf+download', suggest a lure to download or access content, which is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/award?keyword=bidayatul+mujtahid+urdu+pdf+download PDF link annotation
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/ce735e.pdfIn PDF document text
    • https://vajugape.weebly.com/uploads/1/3/4/7/134767319/9503362.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/38497380864.pdfIn PDF document text
    • https://tidosivapozagul.weebly.com/uploads/1/3/4/3/134390518/buxisuvuv_wimumikib_xapezamagenumab.pdfIn PDF document text
    • https://rizizisexulap.weebly.com/uploads/1/3/1/4/131407181/negup-safupugisano.pdfIn PDF document text
    • http://sunazeremitiwu.mypressonline.com/ecology_environmental_science_and_conservation.pdfIn PDF document text
    • https://porujeworor.weebly.com/uploads/1/3/2/8/132814718/zatiworugepiz.pdfIn PDF document text
    • https://lotureze.weebly.com/uploads/1/3/1/3/131379444/gokirozozedovigup.pdfIn PDF document text
    • http://natfreshik.fun/44400907444g6y3d.pdfIn PDF document text
    • http://mnogoturov.com/lijokimonufomibkno06.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/samsung_galaxy_tab_4_sm-t230nu_price.pdfIn PDF document text
    • https://disemorabegelam.weebly.com/uploads/1/3/1/3/131383982/vuketinasefimokomufa.pdfIn PDF document text
    • https://megudetezibiso.weebly.com/uploads/1/3/0/9/130969982/78b57f1bc91c.pdfIn PDF document text
    • http://lafutib.sportsontheweb.net/winkler_method.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/new_moon_2021_january_india.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/samsung_apps_store_for_android_free.pdfIn PDF document text
    • http://ketabigumowun.atwebpages.com/ignatius_study_bible_online.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/keithley_dmm_2000_datasheet.pdfIn PDF document text
    • http://rixumigeva.epizy.com/wugel.pdfIn PDF document text
    • http://degejukifukux.epizy.com/bidofilodo.pdfIn PDF document text
    • http://rusakarazixano.epizy.com/72378578808.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001251a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1251A 21272 bytes
SHA-256: f96b04ab9b7c9ab9faa3df052b54baad47f29fbcc380dbf79da53ce904f4d534
font_00_sfnt_off0000eea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 5420 bytes
SHA-256: 0dff8a5a23a491fcd13e812d39aad701e838747b918511ad9f478c52cb75f7c8
font_01_sfnt_off000100fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 10476 bytes
SHA-256: 288030e0a3073fe2f0d919c064132c9e015217af6a20a8bfd253b440d8c20ad2