Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1354064f77b84de…

MALICIOUS

PDF

85.6 KB Created: 2021-02-21 01:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 51ab98bba397f298dcf43ad5737f0121 SHA-1: a9a0c636ea355138c5f1c11f30536df219043126 SHA-256: b1354064f77b84de954d23ddadb9be1ce75070eb12cedd6ad1259b4b8d937325
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://leonvi.ru/wix?keyword=st+lamberts+sioux+falls+sd PDF link annotation
    • https://duparumiwope.weebly.com/uploads/1/3/4/7/134707207/nimasapuzav.pdfIn PDF document text
    • https://banafovogakake.weebly.com/uploads/1/3/5/3/135326552/disutiti-lawumowokuxiled.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/cKjeJja/puffin_web_browser_pro_apk_free.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/Wjigeii/addons_for_minecraft_app_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/elgHsZe/mma_manager_mod_apk_0._33._2.pdfIn PDF document text
    • https://pimidunobesuxig.weebly.com/uploads/1/3/0/9/130970022/0bfe3b593a8a6a.pdfIn PDF document text
    • https://demijogukif.weebly.com/uploads/1/3/1/3/131382539/9505226.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/3xigghb/89731313044.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/jgewggr/mars_hill_weather_radar.pdfIn PDF document text
    • https://rawekawus.weebly.com/uploads/1/3/4/4/134467784/4956054.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/hjshdbi/65551479071.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/gFjcfih/applock_pro_apkmos.pdfIn PDF document text
    • https://bewotababuruga.weebly.com/uploads/1/3/1/1/131163836/dopudazo-zevegumimanimuj.pdfIn PDF document text
    • https://motonikepo.weebly.com/uploads/1/3/0/7/130739202/vipuxazibeseru-dapaxus-wokemaj-nigon.pdfIn PDF document text
    • https://cdn.sqhk.co/fasuzozo/ij3vShc/crowdsourcing_websites_crossword.pdfIn PDF document text
    • https://lawuzifelive.weebly.com/uploads/1/3/4/0/134041442/firig.pdfIn PDF document text
    • https://sasozubavurak.weebly.com/uploads/1/3/4/8/134886198/dujefijelujofotir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zaxexopufo.epizy.com/43443334877.pdfIn PDF document text
    • http://mivuturirem.rf.gd/algebraic_expressions_worksheet_year_8.pdfIn PDF document text
    • http://niwuganol.epizy.com/bugdom_pc_game.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_off0001044c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044C 5140 bytes
SHA-256: 5385f99330d3ab095ccb10e0f5cfb8e5c13b412ef4aa3822f335b1ec38fe72ea
font_01_sfnt_off000115ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CA 10952 bytes
SHA-256: 7ec3a961e8ba1fa3547480b60887059098c5b0bdc8697a847f45911babd1adac
font_02_sfnt_off00013b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f