Malicious PDF — malware analysis report

Static analysis result for SHA-256 f842bfb51104b09b…

MALICIOUS

PDF

86.6 KB Created: 2021-04-07 20:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4363b9f3c49e3fd38445fa8f02de86b7 SHA-1: f33e295a468de927dba3713a907489d5ae80a816 SHA-256: f842bfb51104b09b3abb8a27aecb853a40dbd13f15d06565a7f06b6c05c5db7c
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm with numerous external URLs, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

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://botokaw.ru/123?utm_term=picsart+pro+mod+apk+2018 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369324/normal_6006af7c7a34b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_600eb4759cdf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464527/normal_605a2677da58b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455886/normal_60018658cdbe2.pdfIn PDF document text
    • http://copyright-help-center.com/modagorogadagogekogapetezhouhk.pdfIn PDF document text
    • http://petersikdar.com/579639940384vhrn.pdfIn PDF document text
    • http://prizinsta365.site/49960051575sx9sb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402949/normal_601d256aea5c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_ea259ef3e24b444fb97816cf1a1bacfb.pdf?index=trueIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_1a284e1c177a4642ab90928d3759e250.pdf?index=trueIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_24ebebf73fac4dacbbe78c60a1603cb8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pazatuv/roribajinexamozugono.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/lanza_chastiefol_forms.pdfIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_4fca95cccbf44321929e928b2148b453.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovilowab/activex_microsoft_windows_10.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_aefacf684b494a9f9843d7f0f9d48195.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_b32cdb87e741473b8708d4cfb6fe8a09.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_off000114ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114ED 5772 bytes
SHA-256: 70cc0bc42c83fdc77a0be9d4c3f385debdc2f3a7f34e22c4f330b2758042543c
font_01_sfnt_off0001287f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287F 10848 bytes
SHA-256: 9132d08766adf0158a63941256c85daf69ef4db5f87202c14727606a988c5cef

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