Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4000920b183a9ec…

MALICIOUS

PDF

78.6 KB Created: 2021-03-20 12:52:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 101058cb5951e1fd07fe8ade45fe830b SHA-1: d5e2759f2c0544d029d3b2854bb4c34bc9ab4f48 SHA-256: d4000920b183a9ec797bdb549d5ff81cce748fb0178bdebd3521e01ab292caea
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links. The document body, though partially obfuscated, contains text related to 'Cours pisciculture pdf' and references to 'wkhtmltopdf', indicating a potential lure. The presence of external URIs and a high ML classifier score further support a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://mezovuduw.ru/award?keyword=cours+pisciculture+pdf PDF link annotation
    • http://pusolaxunu.66ghz.com/70022877787.pdfIn PDF document text
    • http://neliwiveles.22web.org/transformare_din_cm_in_inch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391899/normal_5fe29e2b20d32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383137/normal_5fc6f30b665eb.pdfIn PDF document text
    • http://geesecam.com/what_are_the_five_major_rivers_in_new_mexicobwpua.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428083/normal_60010d64088f6.pdfIn PDF document text
    • http://oneitshop.info/how_to_connect_network_using_cmdsmcjz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446496/normal_601b6d294c4a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/asus_vg248qe_driver_windows_10.pdfIn PDF document text
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_d7c4daebf7754fef86b9984d52cc4985.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kegovev/optiplex_7010_motherboard_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/9177170659.pdfIn PDF document text
    • http://mesovinofezesat.epizy.com/catalogue_oriflame_maroc_avril_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/neposijasiwut.pdfIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_2146407203e04d1dafbfee5171fecb3c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/konidobelinogita.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_02e4ed3e88864c979ac65829117c4506.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/77895496207.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/vakifukutamosibaseguxizaz.pdfIn macro / runtime command snippet
    • 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
    • https://s3.amazonaws.com/novipaliwid/7789549620In macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 4844 bytes
SHA-256: 66cd403f98120786fb4c3415fd89fc47238959221f6ec0340ba041e48f873435
font_01_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 12056 bytes
SHA-256: f88da0e7ba81390ea41755ea3bc0c0564b564b162695ef0f2c7efe3b80949f25

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