Malicious PDF — malware analysis report

Static analysis result for SHA-256 d598e03214c756e2…

MALICIOUS

PDF

89.2 KB Created: 2021-02-22 07:45:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c13cc38a28b1fc2cc9bf039f412dbd0f SHA-1: d040f6c7d155471c6d1b719506939ed64bb1a145 SHA-256: d598e03214c756e2fa21cb3c1f315dc584b454d064a62dad1a00b0c37b910aa4
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body appears to be obfuscated or corrupted, but the presence of links and the heuristic firings are sufficient to determine the attack pattern.

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
  • 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 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.
  • 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://yafferge.ru/123?utm_term=eat+well+for+less+book+tesco In PDF document text
    • http://nobirejajatit.iblogger.org/fabumuguwogalafekusisut.pdfIn PDF document text
    • http://jafetezaki.iblogger.org/81632357233.pdfIn PDF document text
    • http://grinallex.shop/absorption_definition_science_simplenhzld.pdfIn PDF document text
    • http://gidpopiteru.com/772030249395j9wm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482882/normal_601067ff8fc9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467038/normal_5feb38781e538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478438/normal_601a1cf183f0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390373/normal_60023610705ef.pdfIn PDF document text
    • http://arboozfilm.com/callan_method_stage_45idxd.pdfIn PDF document text
    • http://kurewegunopef.66ghz.com/birthday_cake_photo_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lenixad.epizy.com/pitod.pdfIn PDF document text
    • http://vuzogumav.rf.gd/nitimelefimikivifota.pdfIn PDF document text
    • http://xowevabi.epizy.com/employee_dismissal_appeal_letter_template.pdfIn PDF document text
    • http://kakafemapekumu.epizy.com/fejaxedifusoxawoguv.pdfIn PDF document text
    • http://bowudizukeb.epizy.com/31634325028.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_off000121b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B5 5128 bytes
SHA-256: e805fe82e7387fd4d842f080010a262671bb552491b9445880d46e8d4bec7188
font_01_sfnt_off00013357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13357 10776 bytes
SHA-256: e98d1823d99e6ea3c960365894eab3d0b3ea60b934c7d29e88b2615cf1cf752f

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