Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d9cbf6434f542f1…

MALICIOUS

PDF

75.0 KB Created: 2021-10-07 19:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c413d2a3ff071189916c2fb95b237a29 SHA-1: f9bf47ccc2d4ff6e43917a0785a9a1fa53eb8924 SHA-256: 2d9cbf6434f542f1d1030fa7fa93e2379c671599d6eec1f2ee06816b4c4cacde
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or malicious intent. Heuristics suggest the document uses urgency or callback lures to trick the user into interacting with embedded links. The presence of numerous unknown URLs further supports a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://prota.ru/upload/files/76734965511.pdf In PDF document text
    • https://kinohorror.com/upload/file/87977126867.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/nojulelukob.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/8134460661.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/disibap.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614920a8d49fd---xigewogebosawebinezuxosur.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/widonaxi.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/sebiwulavavotibujomaja.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/zisapunibefenomonowo.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/5647042374.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/49738609024.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/76290578154.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/69868326508.pdfIn PDF document text
    • http://sdes.in/uploads/7220272211.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/66331808636.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/lidimilewamivumoxasudof.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/namurirawuzomojujapex.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/xaguxow.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/16752154767.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613964ec6c57c---mifeletifosig.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/1230007060.pdfIn PDF document text
    • https://ksboutlet.com/file/files/posomivurulisijubix.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/69310336895.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/rifitosefubegiwonorafiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=expiry+date+excel+templatePDF 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_off0000bf89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 10480 bytes
SHA-256: e687522f038baa069a9aa70b38a3b1a4eef7f01bc4a882c46d72ee8a7a6441f9
font_02_sfnt_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 18376 bytes
SHA-256: 1ded072b9ddab6259ba3602a67f754d17bce7bf6ad47cccc47ddb13cb375330b