Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8eef10bf77db7c2…

MALICIOUS

PDF

73.6 KB Created: 2021-02-24 21:35:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 339b5e59984f62428970bc7ec13fb7fb SHA-1: 5fa143c73010b56082b07d0bca38844976a38bd6 SHA-256: c8eef10bf77db7c27e18d47e3252a698d7ba0306541860c018020bb696eb3c1d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, indicating a link farm or SEO poisoning attempt, with one prominent URL being http://beviluxenumiliv.mywebcommunity.org/fitafaxi.pdf. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bologen.ru/123?utm_term=national+geographic+animal+encyclopedia+australia PDF link annotation
    • http://beviluxenumiliv.mywebcommunity.org/fitafaxi.pdfIn PDF document text
    • https://kesizibewasi.weebly.com/uploads/1/3/0/8/130813921/155046.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415754/normal_60036dbf2db3c.pdfIn PDF document text
    • http://golixudib.mypressonline.com/the_rime_of_the_ancient_mariner_very_short_summary.pdfIn PDF document text
    • https://mejekuveko.weebly.com/uploads/1/3/5/3/135392268/e89990f9.pdfIn PDF document text
    • https://dowixedazu.weebly.com/uploads/1/3/1/4/131409709/wirudir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472776/normal_5feb6552ed075.pdfIn PDF document text
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/juwaf.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/zurakopu.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/crazy_little_thing_called_love_song_writer.pdfIn PDF document text
    • https://vapasunodisina.weebly.com/uploads/1/3/0/8/130873802/gogaluvobarivu.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/penale/96293223204.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/68911522117.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/internal_combustion_engine_heywood_download.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/79031871982.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 5556 bytes
SHA-256: 7bc897de75374ddd967ca7eab335a5f672666c276b5f598dc14c7a5bbe2ed298
font_01_sfnt_off0000f5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F9 10360 bytes
SHA-256: f272c02a89c4b96d25739bda95f961313fb4b835b7190e9339757f0049e6bd02

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