Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7dcd66b0a933f6…

MALICIOUS

PDF

72.4 KB Created: 2021-09-24 14:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5a2747bc48a444b8ce5626eb6ed24bf SHA-1: 6ae1b269cae8ff2cda6d18b5d9383ad5a2d1a7db SHA-256: ed7dcd66b0a933f6ac334341270a45c60201e85024abef8fa35ab9f57c86c444
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm on disposable hosting, likely to distribute unwanted software or facilitate phishing. The presence of numerous unknown URLs further supports this, as they are likely part of the distribution infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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
  • 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://keepingscore.org/userfiles/file/tifoxo.pdf In PDF document text
    • http://moutierrozeille.fr/userfiles/file/1806527694.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109071004301781.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/79764460528.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/tumor.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/21535210190.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/takudolegadawilevul.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/tonazokebubivo.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/37806596319.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/48452156440.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b16448934d---wazorosuwomilix.pdfIn PDF document text
    • http://schokofontaenen.de/idata/96084918947.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161495e44b436f---37005454908.pdfIn PDF document text
    • http://weingut-suppan.at/files/pikujerujesobuxizexit.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/jupagumogovebof.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/gudubufufofu.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/88003577574.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/vobox.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/3650646202.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/10677057055.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///48396700217.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/24743694325.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109240508396981.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/waporudapemisozubar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=cloud+tv+premium+mod+apk+2020PDF 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_off0000b26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26E 18448 bytes
SHA-256: 214d8bee0cbd1c40c902785c805650230ecc70d9a0b4aad28c34a0cbb5b61c4c
font_01_sfnt_off0000e17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 10812 bytes
SHA-256: ee5a3e90eefe27ca82be9447d7d43598f1f1ecad7bdab98030a53f578d8c7a15