Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55cc64f00661161…

MALICIOUS

PDF

85.3 KB Created: 2021-03-19 02:48:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ff0a0413b04adb81f0109bfdcd6ac3e SHA-1: d0b317d1244f053f36dbc29a5b4d4922b5112f3f SHA-256: f55cc64f006611618db1c5dad4019adf7c76e5bf7639a64bba2bf669a211f70f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files hosted on various platforms, suggesting a link farm or SEO spam campaign. The primary malicious URL identified is dafemum.ru, which is likely used to distribute further payloads or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=flow+line+maps+geography
    • https://libepuve.weebly.com/uploads/1/3/1/4/131407284/kabagozetusifesulebu.pdf
    • https://gosawopidelogeb.weebly.com/uploads/1/3/4/7/134714887/safivusifetelilakev.pdf
    • http://potaberukogox.66ghz.com/82466270223.pdf
    • https://jotabaputeja.weebly.com/uploads/1/3/5/3/135350690/46fd6a9.pdf
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/8103101.pdf
    • https://kajavowonedefa.weebly.com/uploads/1/3/4/8/134858644/derum.pdf
    • https://vugalemudapitos.weebly.com/uploads/1/3/1/1/131164275/poludexiji-nefan-lezelowenufe-turokebunuxa.pdf
    • https://rinuwunebod.weebly.com/uploads/1/3/4/7/134750090/5334648.pdf
    • https://boviseweduxiraz.weebly.com/uploads/1/3/0/7/130776594/1751fbad2.pdf
    • https://fekawuzode.weebly.com/uploads/1/3/5/9/135993312/rukijikolazo_xamepip_tujikagar_nenimowivu.pdf
    • http://tonozezoziw.iblogger.org/homograph_worksheets_5th_grade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bb5a6134-e9bd-49f1-8c5b-e908742032a4/kabale.pdf
    • http://kiwozoma.epizy.com/bazabubowume.pdf
    • http://wupenokisu.epizy.com/wufotiwijepuxonopaduku.pdf
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_a0f97ccbbb8e4a5e92b44708c176fabb.pdf?index=true
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_7f56e4dcd4cb44e4839f8523186a4057.pdf?index=true
    • https://s3.amazonaws.com/nagev/28912327069.pdf
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_eca2e44db77347548c21fb14d9b90075.pdf?index=true
    • https://s3.amazonaws.com/vufuzewasi/mailchimp_form_integration_wordpress.pdf
    • https://s3.amazonaws.com/xovekolamoxe/characteristics_of_useful_accounting_information.pdf
    • https://s3.amazonaws.com/davubewu/sewezute.pdf
    • https://s3.amazonaws.com/sagotomagin/jigaxalidisiw.pdf
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_7b34e4d1df2f40288ffe5669b01b6f8f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4e91230f-21ce-429e-9f4b-1d6afecbce6e/how_to_connect_iphone_to_ps3_remote_play.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ee5.bin
7e3d37b870433e847ea9c846e74f1c720fb041fee5b4049da3272ce1d64d7fe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE5 5384 bytes
font_01_sfnt_off00012122.bin
c5eea15aa5716699039021053842e41770854d29c67a0051feedfb7c5b5ada1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 11332 bytes

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