Malicious PDF — malware analysis report

Static analysis result for SHA-256 2745b1bc0ab0a772…

MALICIOUS

PDF

84.2 KB Created: 2021-04-24 16:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a53424f19241f792446a7020b27538bd SHA-1: 54f2d44954ae28da4b56ff7a68d4734434c9553f SHA-256: 2745b1bc0ab0a772dc7a2740a9f17f683c1814a6646fce27161ea7b6258cfc0b
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 of which point to disposable hosting or suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the PDF structure and embedded URLs are indicative of a phishing or spam campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/strik?utm_term=sagemcom+f%2540st+5260+router+wireless+specs PDF link annotation
    • http://summ-green.fun/7828962949397tzv.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/probabilidad_condicionada_ejercicios3i66x.pdfIn PDF document text
    • http://forexgeeks.net/vexez0gon2.pdfIn PDF document text
    • http://maddot.space/how_to_open_system_preferences_on_macbook_provtlsq.pdfIn PDF document text
    • http://cg-designer.xyz/gimofufiseg4hi1z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378149/normal_6064ee57ae8a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455196/normal_5fe420bdd234c.pdfIn PDF document text
    • http://driveformclanemilwaukee.com/27466442934sr248.pdfIn PDF document text
    • http://magazinrf.xyz/medical_terminology_a_living_language9nlor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387061/normal_5ffd37bf17cbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415783/normal_6041e7dfd1404.pdfIn PDF document text
    • http://mif-smeh.space/bangalore_bus_route_mapaqu7s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459482/normal_5fdb981cd4caa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_4a96ba5bdce14efbb92e86a96609cae6.pdf?index=trueIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_09cfe25ffbe24189842c6768295bb817.pdf?index=trueIn PDF document text
    • https://f7b0ef4b-317e-4f07-901b-4de91a029b50.filesusr.com/ugd/50f142_5b24f4e63ebf491e8a0fa42ed9415353.pdf?index=trueIn PDF document text
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_0363d8a832354c20824a12941e49195a.pdf?index=trueIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_b3d2d99c84f94da098ebc4a7a3c7ff02.pdf?index=trueIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_ef45cdbde28b48849c1cf43b0f38d120.pdf?index=trueIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_2fb4191c8bec4c71b98b52e5cf7af3a5.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_1af65f3caafe4f7793caa07c342e0162.pdf?index=trueIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_336a77c4fd5a4e728ec20ced7c570a03.pdf?index=trueIn PDF document text
    • https://b1394492-4877-47b1-8bf2-e962974baa99.filesusr.com/ugd/3e4b7a_667f25d4a00749728b343674621d071d.pdf?index=trueIn PDF document text
    • https://dfabac9c-3a78-4d86-b112-ccf1750024e9.filesusr.com/ugd/b46e2f_681a2e13c9a34d4b97a9abc1a4ca7ccb.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10881 6412 bytes
SHA-256: 527216c82f3a99f82475c5c1409a98e87fe4c24aea151dc04f00b5de155d16f8
font_01_sfnt_off00011e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E55 10820 bytes
SHA-256: 8d1fadd15c1aeb318be5efc3bd38b0894338cbe5ef5bb3fdfbf74459a9b9306d

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