Malicious PDF — malware analysis report

Static analysis result for SHA-256 04df4545f11449cb…

MALICIOUS

PDF

82.9 KB Created: 2021-03-09 17:01:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 789994c37064f02d6da93b597ecb87e0 SHA-1: 5060cdcc09455fd33b7d694ecfdf6bf141a39480 SHA-256: 04df4545f11449cbd1e5eb642a948324b0867ea9c1c34e7cbccb0c941dbd2fe8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the presence of numerous external URLs is the primary indicator of malicious activity.

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://lozipotod.ru/wix?keyword=linear+word+problems+in+standard+form+worksheet+pdf PDF link annotation
    • http://kitafoged.medianewsonline.com/what_does_the_lord_say_about_divorce.pdfIn PDF document text
    • https://mazazujusuvazix.weebly.com/uploads/1/3/1/8/131856432/wirem.pdfIn PDF document text
    • http://tojumuwuluso.iblogger.org/background_free_psd.pdfIn PDF document text
    • http://gozatelaji.22web.org/free_loft_bed_plans.pdfIn PDF document text
    • https://sivevaredewiw.weebly.com/uploads/1/3/4/4/134464028/8636186.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/laboligesuvu.pdfIn PDF document text
    • http://kitixukizogutik.mygamesonline.org/that_time_i_got_reincarnated_as_a_slime_light_novel_volume_11_download.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/92211460009.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nekepozime.epizy.com/wezamades.pdfIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_a6c9d3aef54a441bb2bd923774df0d07.pdf?index=trueIn PDF document text
    • http://jefevuxivux.epizy.com/orissa_human_development_report_2011.pdfIn PDF document text
    • http://sejisetelasisel.epizy.com/81353191714.pdfIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_816df2715eca4fbab3ac87fff65ed5bd.pdf?index=trueIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_7f3e7db946404d18a7598bafe09545d0.pdf?index=trueIn PDF document text
    • http://mefowoweman.epizy.com/empi_300pv_neuromuscular_stimulator.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 5520 bytes
SHA-256: 58454aafda0b91eaa16e8c4d79226547d29b4e254e7d0e5f8e029f843ff64e5d
font_01_sfnt_off000104ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 10620 bytes
SHA-256: 00bdd1adfca3a42b02d06544f7ccbce002465c734eb7051b5ef885da2dc2e878
font_02_sfnt_off0001292c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292C 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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