Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba859137bc80d590…

MALICIOUS

PDF

137.5 KB Created: 2021-03-14 23:47:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ee6d9ced8dacbd4863e0eb22b2522774 SHA-1: 1d3dcfa046f95c9a4fd06e160040357b0ee0cfa0 SHA-256: ba859137bc80d5902f8674f9d241f7c03a69f49a18fdd2da2e95d3c9a66f4268
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 0.9970

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://jacksth.ru/award?keyword=rural+marketing+pdf+notes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482872/normal_60487076e78f9.pdfIn PDF document text
    • https://cdn.sqhk.co/suxupijisajo/hjcichi/personalized_cast_iron_cookware.pdfIn PDF document text
    • http://gokawojop.scienceontheweb.net/68990959183.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/C1jbBih/tamixujodigazonuvefa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375894/normal_5feeb81e2d1c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459777/normal_5ff60f3ab8c2a.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/hhi9Oig/12712602750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490930/normal_603f620f15b77.pdfIn PDF document text
    • http://bullbananavannaone.xyz/girlfriends_guide_to_divorce_cast_changebs4un.pdfIn PDF document text
    • https://cdn.sqhk.co/nanubebebot/dCthec7/voice_recorder_audio_recorder_sound_recording_app.pdfIn PDF document text
    • http://muzoc.xyz/tenakisamada4ylyb.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/71153063330.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/gfeOidw/gaming_wallpapers_hd_download.pdfIn PDF document text
    • http://ideal-it.fun/22718815966597ch.pdfIn PDF document text
    • https://cdn.sqhk.co/xafelaxadoju/IhdihCk/bominavawixaxafa.pdfIn PDF document text
    • http://varistop.site/puvuwediluwajedszs.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/jfijEgh/top_10_worst_wwe_finishers_on_trampoline.pdfIn PDF document text
    • http://triple-doska1.club/hipaa_consent_form_templateaxai1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379616/normal_60292240eb909.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://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_3baa132406b34599af430df45fee1387.pdf?index=trueIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_84d8b8faf9bf40a9a43a2b492b00c1d7.pdf?index=trueIn 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_off0001bb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB04 5432 bytes
SHA-256: 44d9a9aa6408a33ae10833a25341fa4f69057b14fa015089ee1b3d20d2bbeb46
font_01_sfnt_off0001cd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD6F 3688 bytes
SHA-256: 4e22e60a246bce7dcc7fc0a4c8b28e7ab3dd6129a08c5ca5f22915609fad43f3
font_02_sfnt_off0001dbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBF1 11276 bytes
SHA-256: 99cf7353c43ae1d0c0c7f65db72db149d2766bcc7039bbce06b255626fc18608
font_03_sfnt_off0002027a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2027A 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953