Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18c9131fc250d67…

MALICIOUS

PDF

88.0 KB Created: 2021-06-01 01:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8bb648df943c5c530d51f3f3674399d7 SHA-1: 5a8672351cbdd8607961deb200f9f48555ca7100 SHA-256: d18c9131fc250d67bd8bcf7eecc238dfa21c409e678ead582d951d5a4922d4d5
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The primary URL, https://xajibur.ru/123?utm_term=angadi+theru+video+songs, suggests a potential phishing or content-luring attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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://xajibur.ru/123?utm_term=angadi+theru+video+songs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384037/normal_60432779bab85.pdfIn PDF document text
    • https://jaragamonobuwuf.weebly.com/uploads/1/3/5/3/135346236/332b04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421354/normal_603364535d387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_6049b48e73d35.pdfIn PDF document text
    • https://mawokivujuruti.weebly.com/uploads/1/3/4/6/134685386/3b6415e21d249e4.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4491665/normal_60b001eac25e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497369/normal_5ff5cc8f69703.pdfIn PDF document text
    • https://tekejixebosij.weebly.com/uploads/1/3/1/4/131452745/zakoj.pdfIn PDF document text
    • https://xanuzejo.weebly.com/uploads/1/3/1/6/131637194/6280450.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403119/normal_5ff99424357a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393041/normal_5fe153bd2935c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393358/normal_6051f06b92379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_601bd2ccbb41f.pdfIn PDF document text
    • https://niramividaro.weebly.com/uploads/1/3/4/5/134517418/tudutuba-litiruma-xupedawineri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449973/normal_5ff8fd73d2b18.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/537d7407-c36f-4956-b5c1-d51187fbfd73/69880311510.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144412137/how_to_install_bodyslide_fallout_4_vortex.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/w/file/fetch/144416112/kipewaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe98460c-5a3b-474e-a57d-f8097ade498a/73918323384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/561cf406-2d87-4660-bc60-90297bbf9498/wefedituxejeden.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d7cd4c-df52-4f9f-95d5-417346bb178b/which_of_the_following_tcp_ip_application_layer_protocols.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144428994/where_does_bluestacks_save_files_on_mac.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/temadewepa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10595 5104 bytes
SHA-256: 0d4bbc60a22a8605242741c1fd37aa8c9492ce52c3bdf3dbf85e5ccb21f9f697
font_01_sfnt_off000116f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F0 11100 bytes
SHA-256: d05237503113f34b15c35dc59c467d3c52e20d946ef525c7bbb30379eef07d9f
font_02_sfnt_off00013d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D24 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8