Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6cbc8e01474e67…

MALICIOUS

PDF

77.9 KB Created: 2021-03-18 20:28:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 904803f5cbdfa1546a4aff79dc8d3bdc SHA-1: 900bcbfb130b408c77210d9bcb15f202c9dde5e1 SHA-256: dd6cbc8e01474e679e6fec6c5d416ba4b5a0c3b822d26c39d2374652ab121af4
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 0.9995

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://leonvi.ru/wix?keyword=showbox+apk+4.93+download+for+android+free PDF link annotation
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/7ab4131e7d8d2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_5fe6c7e3961bc.pdfIn PDF document text
    • https://vinaribibivo.weebly.com/uploads/1/3/1/8/131871854/piruku-sozazumuranafi.pdfIn PDF document text
    • http://vuroxinizona.scienceontheweb.net/isg_blockade_selber_lsen.pdfIn PDF document text
    • https://dodukitomot.weebly.com/uploads/1/3/1/4/131407143/wawasufizuwone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382405/normal_5feb8c75423fe.pdfIn PDF document text
    • https://xujupowosorome.weebly.com/uploads/1/3/4/4/134485259/8586727.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387711/normal_5fca136dde47a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423136/normal_5ffd1caf4ea41.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/35959567814.pdfIn PDF document text
    • http://lazategomid.scienceontheweb.net/tree_of_life_meaning_lds.pdfIn PDF document text
    • https://fifukujujaki.weebly.com/uploads/1/3/2/6/132680890/fatir_lopitojuwe_mixufemegujakor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_1101b2cb155b4d2aa90b6994cdccc6b4.pdf?index=trueIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_112fb9dd6ca2456f92fc3aec5334eedb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c597a7e-a848-43ae-8c9a-bd0bd6c3f255/24087372936.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_68824e0955b84beb97c1d51b55e8cfaa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd9cb17-b74e-447e-8280-81917c6c0b1a/venelodanoxelomofuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39383dee-7203-4533-bb8d-c1496389b291/fibewivev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa942d68-bcb5-40b4-b9dc-680959ca799f/60155250146.pdfIn PDF document text
    • http://kexomun.myartsonline.com/advanced_design_and_analysis_of_algorithms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d14d900-9f9b-4619-aac0-bed3c71f7721/setagigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1499c39-2db0-4274-8f0f-31904afa51d3/troilus_and_cressida_act_2_scene_1_summary.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_off0000e685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE685 5856 bytes
SHA-256: bda57bb678afdf3aad5c5a2f1fecf8507e39865dc8ec0720aa530b1ea4ef1378
font_01_sfnt_off0000fa85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA85 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00010313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 10708 bytes
SHA-256: 05cd2d5a8758dc4d3d0afc410da65efb03b49937aa0a921c488dd8b237cb56ac