Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94ef81e6a0cc11b…

MALICIOUS

PDF

75.5 KB Created: 2021-02-18 04:15:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35e049ec41b522f3648db26510f80399 SHA-1: 4a617958105458df351c3a17e102edde6d65a0e2 SHA-256: a94ef81e6a0cc11b2db03c8ef99ec0f835c74f56fd83b1fe5518b05f62824454
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 Weebly and iblogger.org domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

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://leonvi.ru/wb?keyword=amana%20microwave%20commercial%20parts
    • https://wilaruxade.weebly.com/uploads/1/3/4/8/134865150/zugopiladedej.pdf
    • https://cdn-cms.f-static.net/uploads/4481059/normal_5fd09fdec6d76.pdf
    • http://doxisodezezaku.iblogger.org/fds8884_mosfet_datasheet.pdf
    • http://ravapusevuj.iblogger.org/robevoni.pdf
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/lolijika.pdf
    • https://cdn-cms.f-static.net/uploads/4390383/normal_600fd82dba3c5.pdf
    • https://lozepexowazabi.weebly.com/uploads/1/3/1/4/131409761/xonivexom.pdf
    • https://static.s123-cdn-static.com/uploads/4448556/normal_5fdd44cf949ae.pdf
    • https://sunarikibuniteg.weebly.com/uploads/1/3/1/3/131381519/6506107.pdf
    • https://static.s123-cdn-static.com/uploads/4408482/normal_60036cf5e0f70.pdf
    • https://static.s123-cdn-static.com/uploads/4461511/normal_5ff1dd959d55d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/petuzutemixuvod/fezibibab.pdf
    • https://s3.amazonaws.com/kosamupim/c_c_informatica_rapallo.pdf
    • https://s3.amazonaws.com/muvojugejoxip/88632349931.pdf
    • http://repefewuvu.epizy.com/alfonsina_y_el_mar_guitar_solo.pdf
    • https://s3.amazonaws.com/zabejuvijolu/wedding_background_video_templates_free.pdf
    • http://fobiwuna.epizy.com/ferrari_california_t_review.pdf
    • https://s3.amazonaws.com/vajefam/viximagerubujokixubimo.pdf
    • http://tebuwibuweni.rf.gd/punctuation_poem_worksheet.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_off0000ebad.bin
78b3124442f40f7dcf016ed1c68e1c77dbd7c7141859e3f4adfb3698c238e8be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 5220 bytes
font_01_sfnt_off0000fd66.bin
a3857624b2d31a724b1b3b64c6e18458333cde405f164bbf01f7cdfcbc0f8f1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD66 10336 bytes

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