Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b400e91a95fce3…

MALICIOUS

PDF

72.9 KB Created: 2020-12-03 16:57:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9578b62830e7d5f8cfbedffd38c7ae30 SHA-1: 7b4866b144cf4703538bffa789246ddb613d8df0 SHA-256: 85b400e91a95fce31f2600cbea8d1e2f015fda05e5084244b35b4a5f5ea05f42
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with critical heuristics indicating it functions as a malicious redirector and a link farm hosted on disposable infrastructure. One URL, 'https://traffking.ru/wb?keyword=klementinum%20prague%20guided%20tour', is specifically flagged as a malicious redirector. The ML classifier and ClamAV detection strongly support the malicious nature of this document, likely intended to lead users to phishing sites or download further malware.

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
  • 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.
  • 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://traffking.ru/wb?keyword=klementinum%20prague%20guided%20tour In PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/fotasu.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/jelefe.pdfIn PDF document text
    • https://dujezipiver.weebly.com/uploads/1/3/4/6/134610991/6388433.pdfIn PDF document text
    • https://wegotutitupal.weebly.com/uploads/1/3/1/4/131453182/laberures-zuzewekuselobe.pdfIn PDF document text
    • https://sokikafumuwo.weebly.com/uploads/1/3/4/6/134697409/kaledazek.pdfIn PDF document text
    • https://tujonodup.weebly.com/uploads/1/3/4/7/134717107/8250990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424692/normal_5f9b019a63e99.pdfIn PDF document text
    • https://gugimamerid.weebly.com/uploads/1/3/4/6/134606591/runumamu.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/93cd16e3-3cb8-4f62-bbcf-ca54f1ab3781/chin_no_ma_kia_tp_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f6cc166-873f-4e5e-bd0c-d7d7253a8987/kujojixeduz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4794b987-10dc-4ea7-9dbe-217301dc6484/86619430038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0e376bc-40cb-45b6-b7dd-f0103470d1ce/tales_from_the_loop_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39803ba8-6df6-4549-96b8-fe3b7f685fe4/tedurikonotelopisiwedegub.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_off0000db81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 5068 bytes
SHA-256: 42eaf56f953a51ce4a632d58cf0486fb52ceb204620e73690d4c59f916bf7259
font_01_sfnt_off0000eca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 13788 bytes
SHA-256: 65aab26f3a6077e07c00a7233401de15f63a4a3a5b7f1462007efb4a1e5405b7

Open this report in the interactive analyzer, or submit your own file for analysis.