Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc50f6dca74d6351…

MALICIOUS

PDF

81.9 KB Created: 2021-05-27 12:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d93bb245a482bf958edc1e77cc0077c4 SHA-1: 76138833721412baf61ad3caa5a48f5c0ef0bf77 SHA-256: cc50f6dca74d63513fc43d0b811b93b8ff3b16155b9cb9a30e6837220d79be3d
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, forming a link farm hosted on disposable domains, likely intended to drive traffic to malicious sites or for SEO manipulation. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/strik?utm_term=install+android+auto+on+chinese+head+unit In PDF document text
    • https://femadupimasimu.weebly.com/uploads/1/3/4/5/134594559/3635508.pdfIn PDF document text
    • https://vudujetejagug.weebly.com/uploads/1/3/4/6/134674723/6942899.pdfIn PDF document text
    • https://karujelibofab.weebly.com/uploads/1/3/1/4/131406149/8685872.pdfIn PDF document text
    • https://sobuxiba.weebly.com/uploads/1/3/4/8/134867950/9210b3bfd06322.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447888/normal_5fc5d64749516.pdfIn PDF document text
    • https://jobeluraxofedir.weebly.com/uploads/1/3/4/3/134317239/7177736.pdfIn PDF document text
    • https://dametubidino.weebly.com/uploads/1/3/1/3/131383661/2441839.pdfIn PDF document text
    • https://ledejikijosud.weebly.com/uploads/1/3/1/6/131607919/wosuteremiri.pdfIn PDF document text
    • https://dogopakuva.weebly.com/uploads/1/3/4/6/134698139/e9a528.pdfIn PDF document text
    • https://komiwego.weebly.com/uploads/1/3/2/6/132695384/kujuzavegikusudutap.pdfIn PDF document text
    • https://nenuvive.weebly.com/uploads/1/3/1/4/131483155/zaxelijaxefesab.pdfIn PDF document text
    • https://xemaxokiba.weebly.com/uploads/1/3/4/3/134350412/xozimef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495997/normal_5fdf162d4866a.pdfIn PDF document text
    • https://wuwejinetuna.weebly.com/uploads/1/3/2/6/132681176/jerogazuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_603bf69299c18.pdfIn PDF document text
    • https://wotakowa.weebly.com/uploads/1/3/4/8/134885303/b60a81a.pdfIn PDF document text
    • https://wivusogonelom.weebly.com/uploads/1/3/5/3/135310870/vutinirosogolod_vigepitodozif_sesezusewub_kisuxepufusotaw.pdfIn PDF document text
    • https://vigojipawus.weebly.com/uploads/1/3/2/6/132695212/jixamoji_xojixumevoxakun_mapofirum.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/44ef5243-9d9a-47ce-af7c-d5e7ee6f3cb9/els_jocs_de_la_fam_llibre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c1720fb-c3c5-4f0f-95d8-0c5fc8253937/xigasujiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a083f0e0-020a-4f5b-82cb-5baf8fbf54be/whirlpool_cabrio_top_load_washer_repair_manual.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_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 4964 bytes
SHA-256: 70e7b22f48ca58c841fbabefac22ffe14b1494733194acb3a8d06537985858d0
font_01_sfnt_off00011481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11481 11248 bytes
SHA-256: 8d4710a0287e57ed119cd21f73369b337c0d8816ad845fbc8fff5f249c5536ee