Malicious PDF — malware analysis report

Static analysis result for SHA-256 be21e777b273ad9a…

MALICIOUS

PDF

72.5 KB Created: 2021-09-27 14:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 19d1692da7fa372135d415108e4b7188 SHA-1: 83192ef0b979609f24bab02809be0f9bef651f73 SHA-256: be21e777b273ad9a643a1aa1f5419ddf969019325887ef646f68c86895127155
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution, disguised as a software crack download lure. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://sushibelovo.ru/files/xowumevutojilon.pdf In PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/vilujoronotase.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/53446818309.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/xizojaxatafakupoxego.pdfIn PDF document text
    • https://codecs.ro/images/file/ramugejokuv.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be901ae36c---93955941051.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/25803558879.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/1233900511.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/zibunebonotijiwasozi.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109200103144674.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/59456423902.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/32921160917.pdfIn PDF document text
    • http://sapthagireesyathra.srikarpagavinayagamills.com/userfiles/file/40818363043.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/pemiwupibuxez.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/zurefuvapolegosu.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/7381171590.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/vonatedazepur.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/51775231738.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/lurobebomebakurivamit.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/54005995593.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/golopiw.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147af4c28c92---lagidubotiletilireturov.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/lasejojijurubeberelepo.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210926135037.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/29320966263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=excel+2016+crack+downloadPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B6 10732 bytes
SHA-256: d23b1943110eddda318d3d3641f169a0b015bb40a4e517c186e1b9059cffa3ae
font_01_sfnt_off0000cb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9F 19184 bytes
SHA-256: 1cefda02978ed9c3c16194fa92c1d8170073312b2b87fdf7fd8e2eaf797aab30
font_02_sfnt_off0000fc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1