Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87ff0121aca38db…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 22:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6df5085598dc1c6d8b4c5966f53a0b27 SHA-1: 261dd04f694124cdb41238c6d8249f005abfff04 SHA-256: f87ff0121aca38dbcb98bc52a3881e22b71c0a82ef2abc11849ebf561b97d756
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically classified as a phishing trojan. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=how+to+connect+to+hidden+wifi+android PDF link annotation
    • http://ackerviewguesthouse.com/userfiles/file/vinoxinogirokefavofetaj.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/28896220321.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/14477043200.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/gokupujen.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/fenipamoraka.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/10591647432.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/80464153051.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/66318144998.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138923f91395---97355594782.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/17915022853.pdfIn PDF document text
    • https://eclearusa.com/images/file/33252335636.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109050420582787.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/63772053869.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/xodizukozevijofiv.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/zedijadoxuzuluzedikefe.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/napezutigefosif.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/15662200775.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/pejajiroveruneloriridimil.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/jerinamuroxipimokufo.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/91647253809.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/6vj13k6a9sjnb3o9ea5hj0v08f/35568844271.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/79990451782.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c44a27e91---13365356267.pdfPDF link annotation
    • http://bioaec.com/userfiles/files/kuxifonadagotubezara.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_off0000b27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27A 15580 bytes
SHA-256: 0c2ba2b000e37f9ed7871576e4d86a73bfd87dec3e8211b38e24f4f48de0240c
font_01_sfnt_off0000d9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CB 10436 bytes
SHA-256: c516897441216dffafb697234b788313cb10d572822dd936a2d7e77028aa862e