Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f53f1dfb55ea5d5…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 06:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ef00d662b1b2e3b8ca32398801516a2 SHA-1: 0a18465ddd3562e3496bc61ce4b94a913d164865 SHA-256: 9f53f1dfb55ea5d587810b036261dd4a53ccc1899140f3a161edbd29a6284eae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on potentially disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://granitnet.hu/editor_up/63184643977.pdf In PDF document text
    • http://mudrberanova.cz/userfiles/file/64278205130.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613493aa71c51---badogelofonigo.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/vewabamotebexisevox.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/1657088133.pdfIn PDF document text
    • https://tomas-music.com/contents/files/58262848567.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/9584844263.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/jujetiwagetagopavepuliduw.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/gajuguvoraxutekojuri.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109020921286090.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/54811713664.pdfIn PDF document text
    • http://simoncaulkin.com/images/29378415380.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/begobomegadodedowo.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/xejozubalobuf.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/zobitubedaj.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/61774609223.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202191_231115_933.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/34245328827.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/febawujudikigarok.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/30493430115.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137aff735558---ketovebetadexa.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/97887579266.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210906085155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=highest+downloaded+games+in+play+storePDF 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_off0000d5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 11028 bytes
SHA-256: 58c198cc2b1b66c3c0ac9b59f38ca54217f40f4ef6c2ffb917e2c65c7e284b23
font_02_sfnt_off0001070e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070E 16952 bytes
SHA-256: d5f585e2a13f0641f16e6f6c0c6d6e59efa38d6a21b7b132a035c3dce688eed0