Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c30a65685de0b6…

MALICIOUS

PDF

78.2 KB Created: 2021-03-22 21:10:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6452931ceef3ec9315c2b6a6cc1d27dc SHA-1: 7cbaec360643d914de7e184d9107a7e0fb57aa49 SHA-256: f5c30a65685de0b6007dc4c89dacaee1e42c96c70ade83e09999b1c6c657f78e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('golowaki.ru') that is likely used to host malicious content or redirect to phishing pages. The presence of multiple external URIs and the 'link farm' heuristic suggest an attempt to distribute malicious links or content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=ignou+ba+marksheet+image PDF link annotation
    • http://xonejalevesezom.sportsontheweb.net/28688655733.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/56964066370.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414847/normal_5ff60db900c7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422908/normal_6056007023b01.pdfIn PDF document text
    • http://rusewigojubilon.mygamesonline.org/nedovowokuru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528959/normal_5ff1dd0544cbf.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/analisis_y_diseo_de_sistemas_de_informacion_senn.pdfIn PDF document text
    • http://bobujopolodusol.mygamesonline.org/carl_gustav_jung_el_libro_rojo.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/bissell_cleanview_swivel_pet_upright_bagless_vacuum_cleaner_belt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_bb73aeb402b7403596176dfd75e12466.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1cf2a10-2653-4bdd-a2b0-25f920b4fd27/winadapepejiponomezozos.pdfIn PDF document text
    • http://xotaferuju.myartsonline.com/gozavomitulokividigu.pdfIn PDF document text
    • http://bosagiriwamokin.onlinewebshop.net/80356860233.pdfIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_f74580812e144dc7900268494a7d8c81.pdf?index=trueIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_aec7c23539634d60a1a38ce956b5a699.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f1cb36e-d375-4020-adcf-e8baeb3ced3e/murematedeseduz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 5208 bytes
SHA-256: b270798e9083fb89faf2b85642f7e4ef3e7ab1800ec7ae8db4981cbe9e637782
font_01_sfnt_off0000f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 11448 bytes
SHA-256: 998198d622a21e607ecfeae48b3aa99cd82e23accf967e339297b83836ab850a
font_02_sfnt_off00011a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A32 4728 bytes
SHA-256: b1e2be10942e848245920f9d3b9c24f1121080630b5696e2ba522cc107bdda92

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