Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cc45c07ff13dff…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 07:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 47f90ad98efdc16e5e42ae7dc348cdba SHA-1: 061a3b5fe29a982303f7b41aa8aa1f60ae123462 SHA-256: 13cc45c07ff13dffa7999ba2e2a27f520d17bc196960b5f07f13bb3e2bfe7dba
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to potentially malicious PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of distinct hosts, suggesting a coordinated effort to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/117ed1bdcaea5c1ae76769158abded20/99815340512.pdf In PDF document text
    • http://siamsnail.com/media/userfiles/files/12103436454.pdfIn PDF document text
    • https://sanidom.pl/img/file/pezefivepinonasemutim.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/61661393921.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/puxotofofipirujarisamowe.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/47716019833.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/fafugawufugitasuzozukaw.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/85980802502.pdfIn PDF document text
    • https://tepihtrava.rs/files/1130474001.pdfIn PDF document text
    • http://belv.ru/userfiles/file/30787622508.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/55499574140.pdfIn PDF document text
    • https://avenue102.com/uploads/file/88578463256.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/23610822031.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/66869822844.pdfIn PDF document text
    • https://interconformity.ro/images/file/tizojaramegozavezetebefu.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/mipomekojotulisijinuradil.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/wusopexud.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/64223864042.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/wogiwikiroladorukisof.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/44627313355.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/gelosifelufewurepipovo.pdfIn PDF document text
    • http://asustainable.com/global/file/99146575192.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22624965151.pdfIn PDF document text
    • https://scalping.ir/data/files/file/50854620606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=kirik+party+full+movie+online+watch+123moviesPDF 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_off0000daf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 11536 bytes
SHA-256: 5def32c7f68f22a8a811a46552688ed022f80e028cfcf564dd0cb07a3931decf
font_01_sfnt_off0000f65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6E 18188 bytes
SHA-256: fd19d47eec9483d02feff9952cfffe47f22ade5d7a8792a21d1dc9235f25a22a

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