Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65420f21b0c1533…

MALICIOUS

PDF

83.8 KB Created: 2021-01-18 12:46:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7cb8802519a5af804af672640b2993fd SHA-1: 59bb0ceb6fe8c34aaf8b7bad9a054d4c294166f9 SHA-256: c65420f21b0c153393f740239cbe2a46539d0f7c5a662c4dae1e54e500c1d6e6
244 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many pointing to disposable hosting services, designed to redirect users to malicious sites. Heuristics indicate a link farm and a malicious redirector, suggesting the primary goal is to lead users to phishing or malware distribution sites. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffine.ru/aws?utm_term=texas+rental+application+form+pdf In PDF document text
    • https://lilobisuzi.weebly.com/uploads/1/3/4/6/134695815/836d9ed1.pdfIn PDF document text
    • https://gidepezugubuwo.weebly.com/uploads/1/3/4/7/134766768/65366f07f1f4.pdfIn PDF document text
    • https://site-1228360.mozfiles.com/files/1228360/sundara_kanda_naa_songs.pdfIn PDF document text
    • https://sobugegebo.weebly.com/uploads/1/3/4/4/134489054/9204209.pdfIn PDF document text
    • https://poxomovuru.weebly.com/uploads/1/3/1/3/131381772/lixavinosu-mazosera-movozokudefeg-luxifujumidu.pdfIn PDF document text
    • https://site-1178547.mozfiles.com/files/1178547/counter_strike_go_warzone_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5f98be0628133.pdfIn PDF document text
    • https://site-1176864.mozfiles.com/files/1176864/71750477893.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/ctXhhhi/xuvaletolivo.pdfIn PDF document text
    • https://site-1215037.mozfiles.com/files/1215037/56212270606.pdfIn PDF document text
    • https://nivikaxixigimom.weebly.com/uploads/1/3/5/3/135322477/4652523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450898/normal_5fa6b2b22069e.pdfIn PDF document text
    • https://gavebinakufir.weebly.com/uploads/1/3/2/3/132302735/7617956.pdfIn PDF document text
    • https://site-1177683.mozfiles.com/files/1177683/ncsa_basketball_recruiting_guidelines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465924/normal_5ff678df1434a.pdfIn PDF document text
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/c32fb85ad9a.pdfIn PDF document text
    • https://bufazori.weebly.com/uploads/1/3/4/3/134377245/xaruwadu_remil_zoregiverup.pdfIn PDF document text
    • https://tumazalewiguta.weebly.com/uploads/1/3/4/7/134755417/mukerusatoga.pdfIn PDF document text
    • https://powilamalowigos.weebly.com/uploads/1/3/4/1/134131405/3033172.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 5320 bytes
SHA-256: 548e77ff4c0ba5713630a01b1f14fc6607e39a49a2e5db3e8b5d12d9acd5f36e
font_01_sfnt_off00011e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8D 10352 bytes
SHA-256: 2967877af85c10fb98903634d39850121971ac4f798cfaa8279185666b72f0a8