Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cfe3b1ced944ba…

MALICIOUS

PDF

76.2 KB Created: 2021-03-15 12:23:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3c28952545af23300bd8ceafd9ec038d SHA-1: 0c21b8f4de9d267b6746de4922e4a45e7a913e8a SHA-256: d6cfe3b1ced944bace36efd7fb444e8fe4bea61d42cadba4a80bc9c753884bf4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users through deceptive content.

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
  • 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://jacksth.ru/123?utm_term=tamil+nadu+human+development+report+2017+pdf PDF link annotation
    • https://cdn.sqhk.co/gewewoturila/jhiggZ8/gisobuzorafofopuzapovenu.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/PigjLgj/driving_school_sim_2020_download.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/38ja5ha/tower_defense_simulator_twitter_codes.pdfIn PDF document text
    • http://prostotit.site/takejifasiwoguzowijubesuxxfxv.pdfIn PDF document text
    • https://cdn.sqhk.co/mifebemige/jdsuAjc/wuwesitegegu.pdfIn PDF document text
    • https://cdn.sqhk.co/rulopojuna/jhahJza/ffxv_apocalypsis_noctis.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/iUnZifX/radaruxalade.pdfIn PDF document text
    • http://9gusevshop.website/orlando_nursing_process_theoryfpdbt.pdfIn PDF document text
    • https://cdn.sqhk.co/negapevu/jeighiL/sasukerulikemofetavuk.pdfIn PDF document text
    • https://vabudefun.weebly.com/uploads/1/3/0/7/130775589/08d18c09.pdfIn PDF document text
    • http://policyhelpcenter.com/junior_digital_design_jobs_melbournec2w28.pdfIn PDF document text
    • https://lalemudisezevo.weebly.com/uploads/1/3/4/3/134359520/renizodagobeloturexi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_c15173064bca4da8851d47ed3d613ca4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kukazowox/android_hex_string_to_color_int.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_eb8c90f33fa04e2280e4c7c945341aaf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gavobawum/jesunixak.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_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 5516 bytes
SHA-256: 3764bbcb4ecc361f849dff42afecab89ca7c09fc0a77bb330592442423a24199
font_01_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 11320 bytes
SHA-256: cc2a334021888c0eef8cdd45bee143a05e35452f419fb16d1f1509cab18b27fe

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