Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd751381c6377737…

MALICIOUS

PDF

86.6 KB Created: 2021-03-16 10:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e26a392b602882b5640764e481f00fb SHA-1: b3801c8b395ed7328571725e9accdb8768c6b103 SHA-256: dd751381c6377737cc421c0a9342e2888bce852cef33baba2d518a194afc9f13
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed and point to other PDF files, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/award?keyword=a+view+from+the+bridge+book+pdf
    • http://igbusinessabouthelp.com/sql_server_clustered_index_insert_performancelrgm8.pdf
    • https://static.s123-cdn-static.com/uploads/4462775/normal_5fc803b70f487.pdf
    • https://lakupofudeb.weebly.com/uploads/1/3/0/7/130775354/1031075.pdf
    • https://static.s123-cdn-static.com/uploads/4446923/normal_5fcec1a70c0e6.pdf
    • https://xatefokagakutil.weebly.com/uploads/1/3/4/1/134108848/mefas.pdf
    • https://kowonuzadanovit.weebly.com/uploads/1/3/4/6/134686130/9300181.pdf
    • http://raffle.website/what_are_the_organs_of_dynamic_equilibriumqasf5.pdf
    • https://zokagagewawo.weebly.com/uploads/1/3/4/3/134346606/gufanidakeseg.pdf
    • http://secureappeal.com/que_significa_talleres_artesanalesk4xbq.pdf
    • https://nupuwuzom.weebly.com/uploads/1/3/1/4/131438231/708941.pdf
    • https://vogapixafaroge.weebly.com/uploads/1/3/4/2/134234717/ximijofurabuse.pdf
    • https://gedepaxu.weebly.com/uploads/1/3/1/3/131378821/zuvenafizaxez.pdf
    • https://cdn-cms.f-static.net/uploads/4451039/normal_601421edd4340.pdf
    • http://vipmanmarket.space/395697527608y0t.pdf
    • http://ch-bewertung-2888.xyz/mejubavuwanozaderij66khq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nigimul/gudapapomoguzo.pdf
    • https://s3.amazonaws.com/mukutud/guvunuvisetovimelobap.pdf
    • https://s3.amazonaws.com/legesiliv/89004107191.pdf
    • https://s3.amazonaws.com/pibajuwi/bekhayali_video_song_hd.pdf
    • https://s3.amazonaws.com/wemofodi/69814794002.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_off0001161f.bin
bbb867cc7f986cf7f04c1285bde351d4d3dcb52584fb6573d778da5f468d96dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1161F 5380 bytes
font_01_sfnt_off00012859.bin
cabf270c611d63ccb39f67e1c6558bff575e34afc9a0461d26b43607572483df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12859 10832 bytes

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