Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db556b5ddbab312…

MALICIOUS

PDF

121.4 KB Created: 2021-02-13 13:09:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cb429c48bc58613d41d191b07bc73412 SHA-1: 0c077838afd010881202ef029d7ba5ba63ccd2a3 SHA-256: 4db556b5ddbab312a4c3dea1981572cfd696f88930d52416f44bfc3c83cc3104
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. The primary external URI points to a URL that appears to be a search result for "agriculture biodynamique pdf", indicating a lure to drive traffic. ClamAV and an ML classifier both identified this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jottigo.ru/wb?keyword=agriculture%20biodynamique%20pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4458622/normal_5fc73569a0e52.pdfIn PDF document text
    • https://kidiveguworuriw.weebly.com/uploads/1/3/4/6/134677920/wigupezovekaxep_mivakuxaxexamiw_nugilokevalubiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486969/normal_5fceb1981c049.pdfIn PDF document text
    • https://gilaniluju.weebly.com/uploads/1/3/5/3/135386901/c6226491f5dd0d.pdfIn PDF document text
    • https://relujebaxarun.weebly.com/uploads/1/3/1/1/131164257/8f3a956af56e99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_5fd8dc1db9ca5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450890/normal_6012518b1dc47.pdfIn PDF document text
    • https://sekugiwa.weebly.com/uploads/1/3/0/7/130739582/zomefojogaje_gowoki_jikizepagi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458144/normal_6006329c492e3.pdfIn PDF document text
    • http://pay-order.info/e2_equalizer_hitch_reviewrai5x.pdfIn PDF document text
    • https://posolefuriw.weebly.com/uploads/1/3/4/3/134374222/7617293.pdfIn PDF document text
    • https://felezawobo.weebly.com/uploads/1/3/4/8/134896203/1854259.pdfIn PDF document text
    • https://talowitutujuf.weebly.com/uploads/1/3/3/9/133999148/fezejitixizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485454/normal_60208837a7c6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491175/normal_5ff7192e9b99e.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/moduxanakuri/tovik.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/twist_of_the_wrist_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/performance_appraisal_meaning_in_accounting.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_off000182d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182D6 5656 bytes
SHA-256: 2d6472f1b752252836b1cd159ab7d99ef069e0c78ab1872480e696f7a7fd499f
font_01_sfnt_off0001960b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1960B 13996 bytes
SHA-256: 8a388233ab131c1533ace1d8aaca21eb724703efecf60ae8e384c46eaaa5e833
font_02_sfnt_off0001c159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C159 16204 bytes
SHA-256: 6ff35bbcdef839a823e086214e5d609f702bf6b4484614f6c4b824d32b7fcc76

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