Malicious PDF — malware analysis report

Static analysis result for SHA-256 c580d869e9381d98…

MALICIOUS

PDF

185.7 KB Created: 2021-05-23 02:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2e003010ff03198334e30f88ada02cce SHA-1: 7c31502e5a5174854bc4eac5d5c3dc63fc291729 SHA-256: c580d869e9381d98596f5ea1d2c97476845481b5420b3a04a7bd556c6b19522f
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and utilize UTM parameters, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic point towards an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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 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/strik?utm_term=percy+jackson+and+the+lightning+thief+book+summary+chapter+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403806/normal_5ff6c45359e36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447880/normal_5fcf071b81368.pdfIn PDF document text
    • https://wesobopaforok.weebly.com/uploads/1/3/5/3/135311180/4313040.pdfIn PDF document text
    • https://baxorejo.weebly.com/uploads/1/3/5/2/135295822/kemodet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423137/normal_60445694b3cdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444095/normal_6027ffd86bb4e.pdfIn PDF document text
    • https://xupodidif.weebly.com/uploads/1/3/0/7/130739682/fatevikumaz.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/738264a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484365/normal_6058cadfbf77f.pdfIn PDF document text
    • https://zurenigexozaxil.weebly.com/uploads/1/3/4/6/134606750/5572225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425768/normal_5fe6ebac96d36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448331/normal_5ff77b1f5d8f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481170/normal_600da7691fb5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_60240edbc2cb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382617/normal_5fe5d07323890.pdfIn PDF document text
    • https://finenomasawovep.weebly.com/uploads/1/3/1/4/131437785/xesefejudo.pdfIn PDF document text
    • https://gomisixazu.weebly.com/uploads/1/3/1/4/131437427/paxalopeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_60167ca85f8c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451352/normal_602beebaf0a60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/507d3e5b-5d4b-44ac-8dd0-db2dcea783db/barbri_conviser_mini_review_mpre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd0a079-e646-4268-bbb0-1a762d5c46de/99395062741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/822e9592-3689-43ce-8445-88ca4a45513e/je_vole_partition_gratuite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74df9554-7058-4643-8f58-ff7aa89748ef/common_idioms_in_business_english.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_off00029bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29BF0 6004 bytes
SHA-256: 7d04b1ec7f39fbcb70f000cd196b7eacfa935ffcfbb078d783ddb8fbd06a5f77
font_01_sfnt_off0002b04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B04B 11656 bytes
SHA-256: 3badbc40305618a06190aea47e8fa6572029d60560cb2f88b46c5d85984dc73b

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