Malicious PDF — malware analysis report

Static analysis result for SHA-256 08fe1941f3d9c94c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 12:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94aaffa390c0b0c3cb1d4d2b6680d231 SHA-1: ca4b43d894352c1b54671da2eb409314bf6192c0 SHA-256: 08fe1941f3d9c94cddb2bbcdcc63e1ed6f07b42d3204903e28f852b0596c1550
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing or trojan distribution. It contains a high number of external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF_RANDOM_URL_LINK heuristic indicates a link to an algorithmically generated URL, which is a common tactic for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=toyota+yaris+2005+service+manual+pdf PDF link annotation
    • http://nguoigiupviec99.com/webroot/img/files/56329765722.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/2094818055.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/dufuw.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/52647584502.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/37603220804.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/dafunada.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/bixodikokarufojotisemim.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/71718153281.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/boxijidubojuwawoka.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc6bc3d869---sivigujep.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/58930767087.pdfIn PDF document text
    • http://1careglobal.com/upload/files/laromafulanututovamebetiz.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/50871935675.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/gaguwukurukadado.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/kamufetezorigaluxufumada.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/tuwamanozufagavojatun.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/66154184131.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/22207173485.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/78200128766.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/17826423704.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/jadaneturariburotub.pdfIn PDF document text
    • https://yuktogel.com/contents/files/47395499294.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/linigexem.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/13211095524.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_off0000d459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 18332 bytes
SHA-256: 5e0e1f4ec8e1976e8891ef2399dd12b7e9f3eac98d463fa7d029701f1769b827
font_02_sfnt_off00011b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9C 11400 bytes
SHA-256: 4a76ab69fa35a130abc149313918f974aff720bb4cc2fd02ff1188ccb3e8661a