Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be220d0b60022a8…

MALICIOUS

PDF

86.4 KB Created: 2021-09-12 06:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d54ddd00beedce2bca651914544181e8 SHA-1: c44f3789f8f1e75306ba132063b331315d472026 SHA-256: 4be220d0b60022a8dc2a82bf4ad1f1d245603e4414c2215dccd65f2aafd07483
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to external domains, many of which are likely part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this being a phishing or malware distribution lure. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://wastran.ru/uplcv?utm_term=ethical+issues+in+science+research PDF link annotation
    • https://viettincapital.vn/upload/files/wubiramubelejuveliwip.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/42242503888.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/kalajetobafeseboxatira.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16134601e91fc7---32134085823.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dopawepokosowowelisabep.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1f66ee3b1---85297757687.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/82585748989.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/tavobafukod.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dejorosajifedas.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/65368267471.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/63839619371.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210911131531122.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/napobasuwomup.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/97573210376.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/5716765752.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/kesalusa.pdfIn PDF document text
    • http://hijoin.hu/editor_up/68408253115.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/rediwevodanituzudej.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210909005317.pdfIn PDF document text
    • http://www.toptehnik.si/images/joleru.pdfIn PDF document text
    • http://dgjst.com/upfile/file/pilofu.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/24451559632.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/81394990454.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://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_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 17120 bytes
SHA-256: 9dad7375667baba613fcbc6f7d6fcdc38d981e25ce2ff34e7fb37289c3f82f8e
font_01_sfnt_off00011c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13457 10292 bytes
SHA-256: 057e0fddd68d7bb801c087738350f95528ce959cb650d941e59f943684780ab5

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