Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18881f7485d8dd0…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 11:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7077e9662336dd926946b37f13393332 SHA-1: 2e90a0ee21ecd6fed788789bd792247fba5eb04e SHA-256: d18881f7485d8dd02194e06938c87e6f1700092a7a2af0c1266efebdf31a48b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable domains, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://padservhosting.com/userfiles/file/90877305324.pdf In PDF document text
    • http://warehousetraining.ie/images/redowujovumuxubav.pdfIn PDF document text
    • http://spharma.ua/files/file/metexenemokodifanebud.pdfIn PDF document text
    • http://www.bash.cl/media/file/pexirarirazuborefopeme.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/lesewipugirudimesuvo.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/fegenogiwukitadoxivez.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614817b57ba05---76444313915.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/34536318595.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/84144643842.pdfIn PDF document text
    • http://varvshistoriska.com/file/36114382690.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/tiriwejelodurus.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210918111928115451dczcb.pdfIn PDF document text
    • http://52963566.com/upload/file/202109190344214271.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/20/file/94287696540.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/42117429812.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/18908689056.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/21775719464.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/mulexifebelowutotofag.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/58262123821.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/kidaromiwadegujaba.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/finilas.pdfIn PDF document text
    • http://eternoohydro.com/d/files/faxoxapafanitetada.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/gabologefusibuvexafawodux.pdfIn PDF document text
    • http://scsychem.com/upload/files/kakeja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+programming+language+should+i+learn+for+android+developmentPDF 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_off0000b157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB157 11104 bytes
SHA-256: 0547b77753af1ef16f631af56ab79a61d8833901260cd5b712acd99d46eb0ba8
font_01_sfnt_off0000cadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 14960 bytes
SHA-256: 0ce93cd1ce797b215b19eeb5644f438c3bbcf00ad52f7cb6a5e1d0a70c002ecc

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