Malicious PDF — malware analysis report

Static analysis result for SHA-256 883f2159260cbeeb…

MALICIOUS

PDF

78.9 KB Created: 2021-02-26 12:17:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27adc257208a4ef9d63d568b88fe2d87 SHA-1: 19067ea85d9b9688bc0c53d1f03d4b22d6721947 SHA-256: 883f2159260cbeeb827e5e60d6bea8577c068eae4ec372d5288166ea32fd9c89
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to PDFs hosted on S3 buckets, suggesting a link farm or a distribution mechanism for further payloads. One notable URL, 'https://s3.amazonaws.com/wewiro/thinkorswim_download_for_windows.pdf', is presented as a potential download, indicating a lure to trick users into downloading additional malicious content. The document body, though heavily obfuscated, contains a search query related to COVID-19 business operations, likely serving as a pretext for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=is+cannery+row+open+during+covid
    • https://cdn-cms.f-static.net/uploads/4482636/normal_5fd7ee5892840.pdf
    • https://bamaxavusaz.weebly.com/uploads/1/3/4/9/134904449/459103781c1.pdf
    • https://xaxarudo.weebly.com/uploads/1/3/0/7/130740130/8917910.pdf
    • https://buwolipirawelas.weebly.com/uploads/1/3/0/8/130874522/fofuronoseg.pdf
    • https://losaburi.weebly.com/uploads/1/3/5/3/135322327/boroluto-fifenotu.pdf
    • https://tewijudejasivi.weebly.com/uploads/1/3/2/6/132682467/a4d5beca813bd.pdf
    • https://cdn-cms.f-static.net/uploads/4458622/normal_60220d00dcafa.pdf
    • https://static.s123-cdn-static.com/uploads/4451368/normal_5fdf1fa2d637c.pdf
    • https://static.s123-cdn-static.com/uploads/4369146/normal_5ff695dadcb19.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wewiro/thinkorswim_download_for_windows.pdf
    • https://s3.amazonaws.com/tesasubawalozan/wozem.pdf
    • https://s3.amazonaws.com/sowewazulejewi/gentleman_s_guide_to_knife_fighting_amish.pdf
    • https://s3.amazonaws.com/jinabisura/59137783626.pdf
    • https://s3.amazonaws.com/lowuwofuxali/12978399463.pdf
    • http://fajesunuk.rf.gd/hp_photosmart_plus_aio_printer_b209a.pdf
    • https://s3.amazonaws.com/woxotopapozokev/how_to_calculate_the_mass_flow_rate_of_air.pdf
    • https://s3.amazonaws.com/defujo/important_days_in_year_in_tamil.pdf
    • https://s3.amazonaws.com/vavale/video_advertising_definition.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_off0000f792.bin
250af69f1dce3991f6df9e74380a7ad79dc7f4b312172f36c74db5c1d67c9d02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 5400 bytes
font_01_sfnt_off00010a22.bin
1bccb132900eba2e6df261b5bd95103c19f4c7bc138f52195d776276b97e2e68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A22 10540 bytes

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