Malicious PDF — malware analysis report

Static analysis result for SHA-256 6317dfa2d26818a2…

MALICIOUS

PDF

81.1 KB Created: 2020-11-13 15:19:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 675345850f490ac706f3074fcc50315d SHA-1: 1975d6c11b9f53bc775e2ffe44d62435b320f79a SHA-256: 6317dfa2d26818a2411f1e1608aee352e73781457abb99882fab18699036a4c2
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it's a phishing or malware delivery attempt. It functions as a link farm, directing users to potentially malicious sites, with one URL specifically identified as a redirector. The presence of a 'Password-protected archive handoff' heuristic suggests a common tactic to bypass gateway scanning by encrypting the actual payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ggtraff.ru/strik?utm_term=esxi+5.5+iso In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_5f8f9d83405e9.pdfIn PDF document text
    • https://bapepewemeg.weebly.com/uploads/1/3/4/7/134702997/vewosefubi-mizisowidi-rofuwilotenot.pdfIn PDF document text
    • https://kigivalivago.weebly.com/uploads/1/3/4/3/134337689/zarikajalakifusakiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384817/normal_5fa5561f18194.pdfIn PDF document text
    • https://ruwadegefanum.weebly.com/uploads/1/3/4/1/134108857/kotajaze.pdfIn PDF document text
    • https://nitaluba.weebly.com/uploads/1/3/4/3/134348735/konujiwiz_dosazagipavota_taxoxetup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414502/normal_5fa8d11179230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_5fa2850e08717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485809/normal_5fa9aa72c2dd4.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/4900675.pdfIn PDF document text
    • https://bilimetib.weebly.com/uploads/1/3/4/4/134435282/1992145.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/vasagesorajirem/rorasatupolokupofelu.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/anganwadi_karyakarta_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a12014cb-f466-4570-847e-97305b3f0658/manido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ec8d732-113f-4505-9e2f-8bff6c5d806b/74735162647.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/bomberman_video_game_pc_free.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00010ead.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10EAD 23172 bytes
SHA-256: 349396784f9730bb0ca0c05529c05f04494ac6f0b363893b1fd8cf35ed6136f8
font_00_sfnt_off0000bfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBF 4524 bytes
SHA-256: 1a20ad287effe2591fc39e73e6446874f5320a61bce07f6a22bce8c221b190ca
font_01_sfnt_off0000cf40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF40 10092 bytes
SHA-256: 83c9fc176e84e1c6ac88f39752964fcc951a7e3547b99a52b3e3c19657fd8f34
font_02_sfnt_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 10124 bytes
SHA-256: 5a04b1a0a8c02fc3bd55d4c16179bc55988fa78b532093b5b48d3bc669626e07

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