Malicious PDF — malware analysis report

Static analysis result for SHA-256 b970d66309cf1df0…

MALICIOUS

PDF

74.1 KB Created: 2021-03-11 02:46:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8d670f09f8cb2f11120ac2c5481908f9 SHA-1: 93fd697d760792ae873e8b8c16bbb9cd03ba3817 SHA-256: b970d66309cf1df053ff7c54780586b015951a2f8926b1ff7b682c863ca53e40
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external links to other PDFs hosted on various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or phishing. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=mossyrock+school+district+facebook PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371799/normal_60041b978b7e9.pdfIn PDF document text
    • https://kavejujutafen.weebly.com/uploads/1/3/6/0/136022690/suvebodogap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_6026ba672f5ab.pdfIn PDF document text
    • https://vedoguru.weebly.com/uploads/1/3/1/3/131380953/3841762.pdfIn PDF document text
    • https://cdn.sqhk.co/lazemowul/jicijDi/hd_boy_skins_for_minecraft.pdfIn PDF document text
    • https://gomimujexewawid.weebly.com/uploads/1/3/1/0/131070583/pifowopedinexa.pdfIn PDF document text
    • http://24goodstore.site/zupevufopigabuxunafeflis5b.pdfIn PDF document text
    • https://ralufuluwifo.weebly.com/uploads/1/3/0/9/130969066/36623da4.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/FjhTrhf/visual_studio_code_connect_to_azure_sql.pdfIn PDF document text
    • http://purpless.vip/save_the_cat_blake_snyder_espaolwqn7e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_c3ed68ba2e974fd5a482faeb33f5a895.pdf?index=trueIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_5f735190a1d04430853557ff2acf1668.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_80ff7f8762dc45e5bbbfc0000301f0a5.pdf?index=trueIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_afaa0e85524a4cc1a9b1cc8507a75daf.pdf?index=trueIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_81d55e22f98f47d2acfaff019b90a76e.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56C 3352 bytes
SHA-256: 91c30e2d1ada78d216450f988df81a9b8af68f06a1eabed5d87816fe5ae9965c
font_01_sfnt_off0000e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 5420 bytes
SHA-256: 162c8f6a144140990ed7064ccd830312ce798ac74073dc5435d336d15bb04076
font_02_sfnt_off0000f3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 11068 bytes
SHA-256: 9dcda3aa0d02d298f9357c045dbd44cf3d8110c074b110c08958b2e76ed69122

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