Malicious PDF — malware analysis report

Static analysis result for SHA-256 8525ede3864bdb04…

MALICIOUS

PDF

90.5 KB Created: 2020-11-19 21:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f8ed59632dd9d38b5288cdacf11c7a7 SHA-1: 14bc7689b05d3cb7ebae5ee7ee8083c553d92cc9 SHA-256: 8525ede3864bdb04fab7c279cdde544b7166c234f86858e6ee09f104fe14f638
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure and a high-confidence ML classification. The file contains a large number of embedded links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The ClamAV detection name 'Pdf.Phishing.Trojan' further supports a phishing or trojan distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://traffmen.ru/123?utm_term=bertrand+russell+interview+lenin
    • https://sinonulu.weebly.com/uploads/1/3/4/6/134654736/sejud.pdf
    • https://pefopurez.weebly.com/uploads/1/3/4/3/134375846/1485167.pdf
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/93c99ef21b44994.pdf
    • https://tutitobogin.weebly.com/uploads/1/3/4/4/134485970/fujemixovos.pdf
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/e8631.pdf
    • https://naxujurimarawe.weebly.com/uploads/1/3/4/6/134640244/fujenabamubof_tifetumikese.pdf
    • https://jotujovogubiraf.weebly.com/uploads/1/3/4/6/134627891/b31149e3bb.pdf
    • https://xotiroxo.weebly.com/uploads/1/3/0/7/130776105/6239290.pdf
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/ruwoneb.pdf
    • https://woliremokeg.weebly.com/uploads/1/3/4/3/134340334/xatuvupitexugim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xopugup/wilson_elementary_school_sanger_ca_est.pdf
    • https://s3.amazonaws.com/gonavo/paypal_money_adder_termux.pdf
    • https://s3.amazonaws.com/kotenu/amc_dine_in_theater_west_orange_nj.pdf
    • https://s3.amazonaws.com/rozebofukixus/346789206.pdf
    • https://s3.amazonaws.com/fotepopunaj/18170101116.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_off00012477.bin
86b2001708428acb4cbf4613e3a762b64dbecb20f2f54c7f8e58df41d651a615		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 5020 bytes
font_01_sfnt_off000135aa.bin
0af31bd54b50940ba1942196adf8a727eee7f624ec3bcf287066933323705d48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135AA 11188 bytes

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