Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d6255fcfcc9336…

MALICIOUS

PDF

78.9 KB Created: 2021-09-23 16:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c9b3652c85d611203ca5db787fe6e86 SHA-1: 907d5072034de106f2d38787ef0812014270fb13 SHA-256: 78d6255fcfcc9336b53762899274fb5926001af4909d7476f161af4cf5fd216b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and repetitive text related to "Madden mobile apk", strongly suggesting a lure for users to download a potentially malicious application. The SE_TRAVEL_SUPPORT_PHONE_SCAM heuristic indicates a scamming attempt, and the ML classifier's high confidence score further supports maliciousness. While no scripts were directly extracted, the structure and heuristics point towards a phishing or scam campaign designed to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Travel-support phone-number stuffing scam critical SE_TRAVEL_SUPPORT_PHONE_SCAM
    Document repeats phone numbers in airline/travel/refund/support language, often across multiple regional phrasings. This matches SEO/support-scam PDFs that impersonate airlines or travel brands and route users to attacker-controlled call centers rather than a normal travel document.
  • 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.
  • 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://www.culturehousesun.org/photos/file/gowotafadapomevusedotipor.pdf In PDF document text
    • http://alnadaoil.com/userfiles/file/87932087043.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/vogexot.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/53289697840.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/35235771930.pdfIn PDF document text
    • https://alkoplast.rs/files/98239010341.pdfIn PDF document text
    • http://findusafranchise.com/files/files/pejedisit.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/96517100249.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/fomuw.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/delixotuxeremaz.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/noxikuravul.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/zasex.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/gowidimilonapix.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/kuvekuwilidir.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/63696169947.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2109211330045602514w7akcasozr6.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb2ec1783f---dajirugoridogivel.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/wunew.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/fifelotetesimejud.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/14539286883.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/fonomofozedimupivetoru.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/41007541030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=madden+mobile+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://dejavu.sourceforge.netIn extracted file (font_00_sfnt_off0000d813.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000d813.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 10412 bytes
SHA-256: a573f3a149bb7b46be8f3148ceb8e4e9ece1a85c25efeeecb626a6ccd05770ff
font_02_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 17476 bytes
SHA-256: 34071bf68c6c33cbbd7c5cccae6e385e5e272210996eabaca1ace296a5b10ceb