Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ba28295242d6a1…

MALICIOUS

PDF

80.6 KB Created: 2021-04-06 00:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 04ba61c8c59b119811e879a0e3e62dc1 SHA-1: 27d4ddd8992d0783048b5f7fc2fcb41828711720 SHA-256: 03ba28295242d6a17e4c24eb2bf6a941d87bdc6598b35e541a0a9ed352d8b743
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with one prominent URL pointing to a suspicious domain associated with search engine optimization tactics. The presence of multiple links on disposable hosting suggests an attempt to obscure the true destination or distribute malicious content through a network of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://jottigo.ru/strik?utm_term=star+trek+discovery+season+3+episode+13+air+date PDF link annotation
    • https://fuwurukuzubefek.weebly.com/uploads/1/3/0/9/130969433/bibumusa_kilifesona.pdfIn PDF document text
    • https://genezekanoz.weebly.com/uploads/1/3/1/4/131413678/vevetuvilurom_dinujelip_jedezoket.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458837/normal_601ff03c56be1.pdfIn PDF document text
    • https://notojusuwetu.weebly.com/uploads/1/3/1/8/131871856/3608861.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480743/normal_5fee763d117e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477626/normal_601d92eac6a7e.pdfIn PDF document text
    • https://tanatomunedasov.weebly.com/uploads/1/3/5/3/135325499/9985820.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378605/normal_5ff26556a89a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417426/normal_5ff633f8cae55.pdfIn PDF document text
    • https://duvefotod.weebly.com/uploads/1/3/1/3/131380754/wejebijujegudu.pdfIn PDF document text
    • https://lodipututu.weebly.com/uploads/1/3/4/7/134765193/movutubik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404308/normal_6006731f357f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388814/normal_6004db67e5599.pdfIn PDF document text
    • https://giliruba.weebly.com/uploads/1/3/1/4/131483170/wozojalelenidivuxob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375514/normal_6037c727e9f24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449604/normal_5fe4405585c63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453342/normal_604ecf18471f8.pdfIn PDF document text
    • https://vepifedufonun.weebly.com/uploads/1/3/1/4/131454255/mugiseso-lejegunokikaf.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/f821b091-5859-4188-b9a5-4d541e4a7f65/67071930317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a91acb-0d8f-4230-91f5-49ec43ed5858/32106230878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d26eac18-04fa-40e2-90ad-27cddb204628/icom_ic-756_pro_2_mods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22c12ea-b1ca-446b-9055-702b4a2d6df0/13567780762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39973c35-fd99-4a83-a18a-9e5988568fab/what_model_is_ce0168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4191d481-f05b-41ed-9fbe-d2d39ff9c9a1/91342874735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c41fb9-4b20-4592-a25a-6974f529eebb/400_day_clock_repair_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e8a889-39ca-47d7-b860-a6cf47c61a19/27871551516.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_off0000fd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8F 5580 bytes
SHA-256: 224568c1bf8e4c97c8fb904c2605443eb15741b2aca52c15e218fff211929ff0
font_01_sfnt_off000110ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AD 10876 bytes
SHA-256: fb3b796aac70641866be8188ee4738ee24a12f7ba601fce8ec8048043db98012

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