Malicious PDF — malware analysis report

Static analysis result for SHA-256 48dd5b4c9f50b41b…

MALICIOUS

PDF

86.0 KB Created: 2021-09-08 15:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: abbfa4f44051b7838db455765d16ebfc SHA-1: 3c88479b397715409ecf889a2cdce48fc11d22ec SHA-256: 48dd5b4c9f50b41b2823994673a87a42f8531cc3233c52f00f26ab939dc7f462
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/fefodezoxitorat.pdf In PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/97926751770.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/67532147846.pdfIn PDF document text
    • http://velisend.ru/photos/file/posudukorifudemuratudemek.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/rikuvuxasogotomu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c56b1a0ceb37e18b24d856f0a4a5d63d/23313426074.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/xuposeruvibisuzoso.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/81917057047.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/24209054576.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/86102558258.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/60679985306.pdfIn PDF document text
    • https://ksboutlet.com/file/files/kazisumuxudetanove.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/64861507200.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f481792438---gemulipurukivokija.pdfPDF link annotation
    • http://nscenter.cn/upload/files/31352386962.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/dalojiwovosekimazapijikap.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/27798464472.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/peveji.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/repijotofipunevizuxesuki.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/buxoripetikiwujajowes.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0ef70a914b1e1ea315f37a9b5e0de272/tebodevokoxap.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/30113912422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=nikon+z7+manual+focus+lensesPDF 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_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 18028 bytes
SHA-256: 533f69841c96596542316591ca8fb57f16681eee738a3798c8080511c4581f28
font_02_sfnt_off0001327a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327A 10576 bytes
SHA-256: 4cc34c37e964bdff151d941371fc88453ea9de536053b12c4c2122ae773a53ea