Malicious PDF — malware analysis report

Static analysis result for SHA-256 94de365cfbd80b11…

MALICIOUS

PDF

110.9 KB Created: 2021-03-14 09:11:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a2eb1b84f0348e45609a2296fd603727 SHA-1: a3fb1d47616a46820cce3d28093f45f5aaf30784 SHA-256: 94de365cfbd80b112ec09c74ccdc5e9921d836ce1456c9ae083202347156793c
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs suggests the document is designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://dugedepap.ru/strik?utm_term=field+and+stream+1871+pro+series+gun+safe+manual PDF link annotation
    • http://dulifisiwal.iblogger.org/how_to_treat_mrsa_pimple_at_home.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/android_one_9_mi_a2y89mp.pdfIn PDF document text
    • https://kigusokitog.weebly.com/uploads/1/3/5/3/135300221/bb90dbf3d7191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450256/normal_6039060482f7d.pdfIn PDF document text
    • http://bonmarket.site/47409687711fsi2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380379/normal_6045dd6d43470.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/96291814557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402745/normal_60360f14a3a8f.pdfIn PDF document text
    • http://vololagabedopi.22web.org/20476348710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421061/normal_60497a3693c9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://mevonaku.rf.gd/usb_bluetooth_for_android_tv_box.pdfIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_d396a0016c5f472bb0e3b076f6044455.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_c8b66e313fc646e992505f96ab889c33.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_d0e7a6f666b4474b96a6ee7ce3ee1308.pdf?index=trueIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_25ec742e2fa24a9e9688dda70c05d6a7.pdf?index=trueIn PDF document text
    • http://ledaruwevegoxu.onlinewebshop.net/62201205372.pdfIn PDF document text
    • http://jalebuvubo.myartsonline.com/weber_grill_supplies_near_me.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EC 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off000129e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E1 5524 bytes
SHA-256: 200eac19f9007d6f3e712478cf73ea1bd0cf16633c835c462be258cb96994ca3
font_02_sfnt_off00013c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8F 11184 bytes
SHA-256: 98fb2ec19299a6f3c55b52e2930a5c8e1f74afd9feea183b846cad44656dae1f
font_03_sfnt_off00015c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C26 12468 bytes
SHA-256: fbafac5f90c46c6c4d58524cc7a3ea0d5468c30c72de1ef05d0c80819f6fb289
font_04_sfnt_off00018554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18554 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
font_05_sfnt_off00019353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19353 6628 bytes
SHA-256: 0ae237a5dde408571fab8df3bd86b2c025494cfe2a20d4538bffca271c7dc61f

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