Malicious PDF — malware analysis report

Static analysis result for SHA-256 f825d27f4c880c3b…

MALICIOUS

PDF

80.3 KB Created: 2021-04-09 01:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 58733626e4388d873ffb6dd248847f05 SHA-1: 25c5a633eadd2954d5f346f4b67b34300cf61102 SHA-256: f825d27f4c880c3bd215916f7bfa46988b6395811cedf18679faa040c9c4cdb0
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, with the primary suspicious URL being https://xajibur.ru/strik, which is presented in a way that mimics a search result. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded URLs suggest an attempt to redirect the user to a malicious site, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=does+papa+john%2527s+have+cauliflower+pizza PDF link annotation
    • http://derilezin.sportsontheweb.net/jewobojupatok.pdfIn PDF document text
    • http://vobafoselalulor.mypressonline.com/39505890685.pdfIn PDF document text
    • http://vamekujo.66ghz.com/tamizaje_cancer_de_cervix.pdfIn PDF document text
    • http://vijoviresole.mywebcommunity.org/11074641777.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/fetesubexugavodub.pdfIn PDF document text
    • http://raraveluwogevuw.mypressonline.com/catalogo_de_cuentas_sat_2020.pdfIn PDF document text
    • http://mukovasisoro.mygamesonline.org/buscopan_bula.pdfIn PDF document text
    • http://zadidibupinumav.22web.org/club_car_lithium_battery_kit.pdfIn PDF document text
    • http://jivavesomuviz.getenjoyment.net/fundamentals_of_assembly_language_programming.pdfIn PDF document text
    • http://mizifasurogik.mywebcommunity.org/pantpradhan_awas_yojana_form_marathi.pdfIn PDF document text
    • http://dibubewivutuva.22web.org/60903041499.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wudujijejek.rf.gd/adverbs_worksheets_for_grade_3_with_answers.pdfIn PDF document text
    • http://vigexosav.myartsonline.com/38982960307.pdfIn PDF document text
    • http://fadezanunadafik.myartsonline.com/fesenamepalefetufiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e39226c-2e1b-48cc-8b88-7aa8c37437f7/bidevujotitapekajasejolab.pdfIn PDF document text
    • http://kamigawox.atwebpages.com/ag_hvx200_manual.pdfIn PDF document text
    • http://terovolej.rf.gd/27326666068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/817e2fe2-ccba-4557-8217-c207525e444f/comptia_a_220-901_and_220-902_exam_cram_download.pdfIn PDF document text
    • http://wuliwopiveti.rf.gd/40842500942.pdfIn PDF document text
    • http://zaduzos.myartsonline.com/46734543207.pdfIn PDF document text
    • http://xipobibupo.epizy.com/89476944806.pdfIn PDF document text
    • http://nufavonazimu.epizy.com/avanza_g_manual_2010_jakarta.pdfIn PDF document text
    • http://vonolukover.epizy.com/bigixovux.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EA 5412 bytes
SHA-256: 1761905aeb23587662de6013ac904c87c3619b14a93bae7c19ad22c97f67279d
font_01_sfnt_off0000e378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE378 4212 bytes
SHA-256: 51cf680e28fffe80847c01d560adbe851395aff6ca4ef31d1e9a8566edf232a2
font_02_sfnt_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 11816 bytes
SHA-256: d48def34477c2ff28c776dfe40d3b0bb2c5c8cd2ae06f64cf4a84dd68e1b0382
font_03_sfnt_off00011a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6F 16752 bytes
SHA-256: ad2af144049b4bb4767c2d3fdbf8d9e20fe6f7c73a46b215119def7731c504cc