Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c37e3d280346c24…

MALICIOUS

PDF

77.2 KB Created: 2021-04-06 17:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb28818352be2df5f487ee06cb21623e SHA-1: 728f49ded39c28559a350c36599f11265d301354 SHA-256: 4c37e3d280346c24dd1d9a3d28ab7ee16901ad88fafd1b1655b4e10c950adb2b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to generate traffic to numerous external URLs, many of which are likely part of a link farm. The embedded URLs and the document's structure point towards a phishing or SEO manipulation scheme, potentially serving as a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/award?keyword=pendidikan+agama+islam+adalah+pdf
    • https://pogugabumivo.weebly.com/uploads/1/3/1/3/131381840/6125041.pdf
    • http://qlemelest.online/modavusebujodid9i6ka.pdf
    • http://xozonline.ru/jenomiwonelogowepewulaqi0m7.pdf
    • https://tefajarusi.weebly.com/uploads/1/3/0/7/130775660/8886613.pdf
    • http://mavito.online/caltrans_bridge_design_aidsh9tpw.pdf
    • http://evgeniy-semenenko.ru/51931470849dahyx.pdf
    • http://giboxibefelas.22web.org/outbreak_perfected_final_mission_guide.pdf
    • http://healthit.space/dvd_screensaver_transparentfwxum.pdf
    • http://reduslim-italiaufficiale.site/woxupogebelonakemegeftjidv.pdf
    • http://opticsystem.website/mobogamefe15sqs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tavokitewigi.rf.gd/rajezikemaludezutisopira.pdf
    • http://metoxitaneg.epizy.com/autoimmune_lymphoproliferative_syndrome_alps.pdf
    • http://birotizedu.epizy.com/5229510152.pdf
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_a3e33aec418b43bc90749754889e83f2.pdf?index=true
    • http://dutagewenurodub.epizy.com/46911350752.pdf
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_079f2e3fe4e14edeae7a1037af9645d9.pdf?index=true
    • http://nofadokar.rf.gd/astm_a36_gratis.pdf
    • http://duwopatovulid.rf.gd/36484230131.pdf
    • https://ff8eac81-0dee-4da4-b7c1-1dee070544a7.filesusr.com/ugd/2637cf_092a0902d57644de97fede243aa77022.pdf?index=true
    • https://3e021c9a-284a-4c54-9ba1-f6d43d4d2ba5.filesusr.com/ugd/a619af_752ef0d1481445deaf7ab5e507905049.pdf?index=true
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_792ab473076744229fabcbfc3e967bc7.pdf?index=true
    • 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_off0000f030.bin
7d8445fb288f3fba51e5c173a7fb737b514b6f2d1815d4833c08dfbd8f2150a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 5424 bytes
font_01_sfnt_off00010286.bin
e05f523e9c0f419855efcc0db8647c75d56815551683a5a14bd4735bffff1e1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 10196 bytes

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