Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea43edeafdb455e…

MALICIOUS

PDF

72.3 KB Created: 2021-03-14 02:55:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1f7c8fc67776af5c07e165d346fc110d SHA-1: 878f2a62bda5c82639b4dea1c78912c9ae04d8dd SHA-256: 6ea43edeafdb455e688606422ac8839af56152a002d42c0617bf7b7bbe86dede
252 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded URLs, forming a link farm. One of these URLs, https://dafemum.ru/wix?keyword=langrisser+banner+schedule+2020, is identified as a known malicious redirector. The presence of a download button lure and the ML classifier's high confidence score further support its malicious nature. The document's structure and content suggest it is designed to lead users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=langrisser+banner+schedule+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_60450e56f2115.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450511/normal_6005dbed7feea.pdfIn PDF document text
    • http://nekidifuton.medianewsonline.com/what_does_alpha_tango_foxtrot_mean.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/46300527468.pdfIn PDF document text
    • https://bamiwesuwo.weebly.com/uploads/1/3/5/3/135390748/9e824d8.pdfIn PDF document text
    • https://zakuximonu.weebly.com/uploads/1/3/5/3/135346146/8951ee474a.pdfIn PDF document text
    • http://rigudozefogo.mypressonline.com/bolens_lawn_mower_for_sale.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/livuwezasuni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369933/normal_5ffb49cdea6d6.pdfIn PDF document text
    • https://gikanirirexenad.weebly.com/uploads/1/3/0/7/130776133/niralegegixefuwosa.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://bopubedoru.myartsonline.com/essentials_of_biostatistics_in_public_health_3rd_edition_free.pdfIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_210d05db38f440d39e7619fc0ac08319.pdf?index=trueIn PDF document text
    • http://vakogez.myartsonline.com/cat_diesel_engine_manual.pdfIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_3152e645f7b148a49160865f6eb8b92c.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_ca35068f55714d0e9aaef8ea31de1a55.pdf?index=trueIn PDF document text
    • http://wovuluvoju.onlinewebshop.net/chicco_mini_bravo_stroller_reviews.pdfIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_07b69b90f2b740169713c429f08494ba.pdf?index=trueIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_df86037188da4052abb99608a289e8bd.pdf?index=trueIn PDF document text
    • http://gurabagoderes.atwebpages.com/wofejinepupugoxuberewi.pdfIn PDF document text
    • http://bamonoxo.onlinewebshop.net/libro_de_fisica_3_secundaria.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_off0000cf9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9E 5248 bytes
SHA-256: a4b92670715cdcc148786f79a0ca085e99c4f2a9f8675bcfe29194a198dc846f
font_01_sfnt_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 10964 bytes
SHA-256: 6bb49032886bff174e70ea35af3c31708a543ec05fd4f0c2f2d35bb78aa714c0
font_02_sfnt_off000105e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3