Malicious PDF — malware analysis report

Static analysis result for SHA-256 d443b76460e2fb9c…

MALICIOUS

PDF

81.0 KB Created: 2021-01-09 23:31:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 20f3f31db71e0eedb2f25bde9ea874a9 SHA-1: 81f80ed3aaa1bc022e6b7ac89529bd7eaec85154 SHA-256: d443b76460e2fb9c145f1cf5dbd17beebba5101313e68eef37d56b06e91c6091
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, indicating a phishing or trojan threat. It contains numerous external links, with a significant number pointing to PDF files hosted on various domains, suggesting a link farm or SEO spam campaign. The document body, though heavily obfuscated, contains references to 'Binomischen formeln rechner' and 'wkhtmltopdf', hinting at a lure disguised as a calculator tool. No scripts were extracted, but the presence of many external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/aws?utm_term=binomischen+formeln+rechner PDF link annotation
    • https://cdn.sqhk.co/dukapudubi/haJgigi/radar_mobile_speed_gun_app.pdfIn PDF document text
    • https://bajazari.weebly.com/uploads/1/3/4/3/134314741/xunazalotu-lebem-ripixikakow.pdfIn PDF document text
    • https://fukituxepuronip.weebly.com/uploads/1/3/4/6/134605821/9232b8214538.pdfIn PDF document text
    • https://gebapawuvafiv.weebly.com/uploads/1/3/4/5/134519736/jewapilinuzukiba.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/idQgiBM/letterboxd_top_250_horror.pdfIn PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/tigugek.pdfIn PDF document text
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/263c1081c.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kefodek/rovavinoretubotedijekavig.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/capital_hotel_school_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/zavatagadolo.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/make_a_fake_pregnancy_report.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/beadboard_sheets_at_home_depot.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e177.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE177 15832 bytes
SHA-256: f3373628ba1d283752ce12bbd819f5695163d399610801a55c5fabc1a22e1d2c
font_00_sfnt_off0000d0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C5 4960 bytes
SHA-256: 2594f7c1b4216a6cfb2eef173d3c05b2dff8b131f6bbe0b06029ebb5ab354126
font_02_sfnt_off00010e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E23 11972 bytes
SHA-256: af0faaa1a981479a9263b6aad831c4cf15e00126a7d17dd228191162da721511

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