Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a62c44494c5424b…

MALICIOUS

PDF

81.0 KB Created: 2021-04-30 22:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f7e4adadce5575c1aac519bb43bead4a SHA-1: 1626ccb172e692e88795c9632d1beed38162b9c9 SHA-256: 5a62c44494c5424b89edb515ed35a1df849285b0555525424d22c2553edcef88
134 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. It uses an urgency-based lure. 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 0.9996

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dafemum.ru/strik?utm_term=items+in+zelda+a+link+to+the+past PDF link annotation
    • https://zerakekume.weebly.com/uploads/1/3/0/7/130739742/dorukitozunoti_feniraxoki_vafagedozob_zerosase.pdfIn PDF document text
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/wupedapufo_joluzebajanalun.pdfIn PDF document text
    • https://tasozowi.weebly.com/uploads/1/3/4/3/134315408/tuvewevulefuwu.pdfIn PDF document text
    • https://xuxefaposil.weebly.com/uploads/1/3/4/3/134393683/ebb2c3c9de5715.pdfIn PDF document text
    • http://pobesegu.scienceontheweb.net/what_did_anna_freud_study.pdfIn PDF document text
    • http://joxezorov.mywebcommunity.org/gugusibekesupasuw.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/fBKicIj/whatsapp_wallpaper_images.pdfIn PDF document text
    • https://mewatejo.weebly.com/uploads/1/3/5/3/135322937/jufem-wenusiku.pdfIn PDF document text
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/buzixisuni.pdfIn PDF document text
    • https://cdn.sqhk.co/texekikevow/XrZw6aB/resinusepapetixarepuwavi.pdfIn PDF document text
    • http://fezelegafefuv.mywebcommunity.org/82949239820.pdfIn PDF document text
    • http://zijezokoriwe.iblogger.org/advanced_java_concepts_with_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/Cidiinh/what_soap_do_you_use_for_soap_cutting.pdfIn PDF document text
    • http://lunenakipusuwi.iblogger.org/bergey_s_manual_free_download.pdfIn PDF document text
    • https://tiforunu.weebly.com/uploads/1/3/1/4/131437018/bawuxeguj_kabugibakuv.pdfIn PDF document text
    • http://bokugezus.66ghz.com/alimentacion_complementaria_2020.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/f9120e45-c4ec-44da-8ec1-cca77ad977c2/how_to_connect_a_ps3_bd_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db346683-05fa-4efe-84e3-827831b3cb76/gijolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8148173-5f35-4e6f-89b4-dc1a3b77d913/xegifidepofupi.pdfIn PDF document text
    • http://nekelaxowe.atwebpages.com/63156535391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/901534d0-c110-41e2-9d88-16a2b686156c/nancy_drew_games_timeline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93406040-320a-4132-b91d-fd1f84ccf2cd/air_fryer_recipes_gluten_free_desserts.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 5152 bytes
SHA-256: bf9e7e6036c89d69199e3bdc06d0c02b7ef5393b0b9e747f809d2c78d77fe2ba
font_01_sfnt_off00010ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBE 11660 bytes
SHA-256: 3a3c864b442074dc445800470f41073bfdac3c76af6940d65cea0d89e14d4e52