Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71165bf12e716ab…

MALICIOUS

PDF

94.4 KB Created: 2021-09-16 06:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d2f658bc48da99e43ec203bbcd6dc456 SHA-1: 5e0b11c95730d6816611526aab2fd07c5caebc06 SHA-256: f71165bf12e716ab723952d7e2d58edb04728ffd78d4e94fc29dcd70fcaf1e79
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains or are structured as link farms, suggesting a phishing or malware distribution campaign. The 'SE_QR_LURE' heuristic also indicates a potential QR code phishing attempt, further supporting the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://philabc.ru/uplcv?utm_term=time+for+android PDF link annotation
    • https://journeywithmypet.com/ckfinder/userfiles/files/zigasutisele.pdfIn PDF document text
    • https://digicpictures.com/downloads/8773523506.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/6529640221.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/vurotewul.pdfIn PDF document text
    • https://camelcarpet.org/d/files/94400694626.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/35860049405.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xarafujola.pdfIn PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/88093577648.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/70608466794.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/81416378133.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109091814399979.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/40658046689.pdfIn PDF document text
    • https://digiconelectronics.com/media/13185989323.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/26007294294.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/nivumolur.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/vegewuraraka.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/85532783442.pdfIn PDF document text
    • https://maria-galland.ru/files/file/butavutevi.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/fibemagefaforapikus.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/63022224042.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pejulor.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/49993937843.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/vomunewazawen.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/50718185860.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/juruvewetidedadalapop.pdfIn PDF document text
    • http://telecycling.org/files/file/45629370900.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_off00010e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001261d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261D 10168 bytes
SHA-256: a9b558ddf39fd05ad3acf25a1cdd3a3bf481041c976f6d48f5b8ea801a944830
font_02_sfnt_off00013cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC0 18184 bytes
SHA-256: 7dfa71442e4dc8a0d946463ce4034d982becdc498b3dc999697e8d1eb7b66b6f