Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0fc0e77e013c79…

MALICIOUS

PDF

72.5 KB Created: 2021-03-16 18:52:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1fdb2a36f4ce31551011459378298033 SHA-1: 0251d998ad3362e80e8751f981660ba74eb032a2 SHA-256: 9b0fc0e77e013c79b5e3fe47fe8d3465b6972fcfdcf3b29bbe5a7e9337e46b55
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous external URIs that point to other PDF documents hosted on various domains. The primary purpose appears to be SEO manipulation or the distribution of further malicious content through these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=is+avatar+an+anime PDF link annotation
    • https://pimelotug.weebly.com/uploads/1/3/4/5/134576353/493032c8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371261/normal_5fe5af9f468eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_600d6706389be.pdfIn PDF document text
    • https://silavetej.weebly.com/uploads/1/3/5/3/135314504/3da19e69d187d7.pdfIn PDF document text
    • https://dikurowewo.weebly.com/uploads/1/3/4/8/134893632/fejen.pdfIn PDF document text
    • https://sexanugujox.weebly.com/uploads/1/3/4/2/134266496/4061265.pdfIn PDF document text
    • https://lurakowufo.weebly.com/uploads/1/3/4/4/134457973/bd14c1e58b53ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459623/normal_604eec81e25be.pdfIn PDF document text
    • https://bagesasadav.weebly.com/uploads/1/3/4/3/134383367/kijoxatema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485710/normal_6034924688c0a.pdfIn PDF document text
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/vizunedenare-wesek-kixomuwisuzo-xetorevidomure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470681/normal_5ff5f69ba26d7.pdfIn PDF document text
    • https://tawedituja.weebly.com/uploads/1/3/4/8/134864040/mewimewazonoruk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_857549634f3c418a8ce20375346100bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e14c1b-c266-4e34-9161-d80f5c7a1084/why_wont_my_garmin_forerunner_charge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4b3e88c-f952-44e3-9e96-387528f32f58/gavoda.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/nimisidigolunajara.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/brief_history_of_time_summary.pdfIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_996194d528f34c43bc4d2604ace4f015.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbdfd9a3-c984-44a6-b8a3-2e7938c56ce7/xidagopoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/bolisavamolulumibuboludav.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/octopus_mod_apk_update.pdfIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_da1c41aa0ed844de93e7d128d7ab9b5a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/cbse_nursery_worksheets.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_off0000e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 4796 bytes
SHA-256: 50a4a47a604923c36f3fd123a6ad0a327fabe54751005bd37b9cf8d42f26f907
font_01_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 10040 bytes
SHA-256: 42572c610261117238f5dffd3505b9a0ff329aa546e94328fb0fede24a5a8e1d