Malicious PDF — malware analysis report

Static analysis result for SHA-256 4041768d2f12f46a…

MALICIOUS

PDF

62.3 KB Created: 2021-09-26 00:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c9ba51ac038326e5487e25fce4b68530 SHA-1: 6ed33b35c5543986b5b7ad5d4c8b78d837606720 SHA-256: 4041768d2f12f46a77d87a1b1b801cdde6e7fb816deb17cf18053de20b44d7ef
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs that point to a link farm, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the link farm heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5428

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://airconbank.com/upload/fckeditor/file/41406149174.pdf In PDF document text
    • https://helicopterleasingservices.com/userfiles/files/xutokisugefefiluguwur.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16132c934947d1---16686741142.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/fanajoniduva.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/18687480874.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/62474436330.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/56700646054.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/19095721335.pdfIn PDF document text
    • http://whygzy.com/Media/Uploads/files/89296096767.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/81501116292.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/xajasawarikaxugaluxuxedar.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090812502773499.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/97074807227.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/99265241652.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/23324988615.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/mazawabiwatonuwafazefu.pdfIn PDF document text
    • https://verner.lt/images/files/44430668914.pdfIn PDF document text
    • http://reflita.lt/uploads/files/vuzok.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/mukoxenutorikomovebonozos.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/47018256509.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/50080845925.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/zoloxiriweteroxuvigexazet.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/99896333810.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/45033041529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=who+watches+your+instagram+profilePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48D 16384 bytes
SHA-256: 5ef5e44aebbb04e9c69faa606ba36078b8fa7e6fe159971cdc1fbafdf6ace3eb
font_01_sfnt_off0000ddf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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