Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d063d74d2554bf1…

MALICIOUS

PDF

74.9 KB Created: 2021-09-13 21:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2790128a586db4d8a283c7d58851ed0a SHA-1: ba714cb92a7321b8fea090fc766aaf48f1b3ca2d SHA-256: 4d063d74d2554bf1479d4dfe0a2c26c2396eac5ffa510db2f1ca78c1546cad9c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of this document being used for phishing or malware distribution. The 'SE_CALLBACK_LURE' heuristic suggests a potential social engineering tactic to trick users into further interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=momo+original+apk PDF link annotation
    • https://yodishit.com/uploads/userfiles/file/76804148688.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/35333047934.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/42627733843.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/tukorexapedug.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/57372552710.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/2371496837.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/tedagiwamudum.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/gutewewasawapifewana.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/40012979614.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/mekaribi.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/wufebuli.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/72409833560.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/viboxomasolagik.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/53419142081.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c84f0b5f95fff27b62e26e2402cf8015/89123677881.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/91933993917.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/35417782839.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/sigirekorojugepu.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/57a7d35203ac98f21c15a6a167a13056/vejemugoxufuxopupejutowel.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/49049777212.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/68202681760.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_off0000be9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9A 10280 bytes
SHA-256: db3592d6bd2393b857c574d94937cba9a212de8058c82fc43759411cea810c62
font_01_sfnt_off0000d59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 19064 bytes
SHA-256: 891efaa2d7086e71e0cf4e1c15287f9d000fac67898538aae9647e5503cf04ce

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