Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f5703d30d9717f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 09:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dcaa0a84348e952834569d787dc9e40f SHA-1: 9cfad003d923ffb189409eff0cf7c9d72c3b0ee3 SHA-256: a5f5703d30d9717fe944e62b0a033844fb46329c176f83bdee6d5a72adea179d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including a high-severity PDF_RANDOM_URL_LINK pointing to a suspicious domain. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used as part of a phishing or callback scam. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external links and the overall detection profile point to a malware distribution or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://wowbond.com/upload/Fckeditor/file/30168529738.pdf In PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/wedasokifasaw.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/92191735385.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/96938031609.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/70256087788.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/ginek.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/wineroviradulureguvetifi.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/26215679480.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/sarubijorikakoxotexukuj.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/35960926066.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/sewekenobolud.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/88568080270.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210910/file/16312374188332.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/20584992116.pdfIn PDF document text
    • http://attlas.center/userfiles/file/35302207075.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/fidodosom.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/74849275426.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/71913110098.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/terigavapitukipud.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/kuvedipiwamok.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16131f507b9665---posowudepevaduwulibiv.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/6521801040.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/10591441269.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/kepusewebazunalebilamu.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/95366643714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pixel+gun+3d+hacks+2021PDF 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_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 11092 bytes
SHA-256: ce67a3f7fecdd3b11c8d1828ceaad93dbc305368bcd8b2b0e85fcaec40bae9f0
font_01_sfnt_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 17440 bytes
SHA-256: fcb5815d9aaebacef1542b431098ce4483a33c46a1cb3b5fcae6c28b9775d78d
font_02_sfnt_off00012497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.