Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d176b26550927dc…

MALICIOUS

PDF

75.5 KB Created: 2021-03-02 19:03:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3d3ab8826bada84f0152de177361506d SHA-1: 4d0333b1fad67d69841bfc0afa5d08d8a0c1765e SHA-256: 2d176b26550927dc50752432c90977402639435d94ad08de94576075a1544260
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/wb?keyword=armstrong%20ultra%20sx%2090%20furnace%20will%20not%20ignite PDF link annotation
    • https://nupepapuk.weebly.com/uploads/1/3/1/4/131484133/xorugexavam-tejitorubetori.pdfIn PDF document text
    • https://fijapirugonobi.weebly.com/uploads/1/3/4/3/134315317/2277398.pdfIn PDF document text
    • http://busforpay.online/how_to_exercise_the_gluteus_maximus_musclefq6vb.pdfIn PDF document text
    • http://loverorajumizi.22web.org/what_is_the_other_side_of_paradise_about.pdfIn PDF document text
    • http://dixojele.22web.org/poxubufigudeniminat.pdfIn PDF document text
    • https://dokegofixak.weebly.com/uploads/1/3/0/8/130873830/34399a72bcf5b.pdfIn PDF document text
    • http://tgesheff.xyz/zoom_h4n_pro_4-track_portable_recorder6ickh.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/hjNOgcd/word_mocha_743.pdfIn PDF document text
    • http://kosolibanun.iblogger.org/19327695545.pdfIn PDF document text
    • https://dulumomotuvubu.weebly.com/uploads/1/3/4/7/134759228/vatamugi-libomazotetozi.pdfIn PDF document text
    • https://repotadidutu.weebly.com/uploads/1/3/4/3/134310826/138704.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/bivanud/lepaxadibefenunupipesen.pdfIn PDF document text
    • http://xutizekuf.epizy.com/wenip.pdfIn PDF document text
    • http://womumilo.epizy.com/disavimepuzapit.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_off0000e52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52E 5648 bytes
SHA-256: 77cbfbf7488ac13c9e64aee114c8e94c0eb66090eb062c50b2757149dcffb74a
font_01_sfnt_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 11268 bytes
SHA-256: 8b1370f6372fa5646419e65efc7ebb1d3c81edd0d545943bdc3eb6d2f671a303

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