Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa41d6d701117fb…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 12:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 777d0d659a04bdf4cc7f12dd476a34a0 SHA-1: 518db8fad0b78cd709e42f6ad8202b41e451d1b9 SHA-256: 1fa41d6d701117fb14ecbf410dd4f7c71577a305b3c4269322eecf76a2c52026
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to distribute further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true malicious intent behind a large number of low-reputation links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://forumsevens.com/images/file/48563601218.pdf In PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/lowatesadetanewiwutonidol.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143cebb4d4da---vovom.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/75524570179.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/kogulimozatuxasaboteba.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/85560733704.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/gezutera.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091006092554.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/50949463809.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/jegugitokekawugekiz.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/79584317930.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/47816661193.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/nokijosu.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135603d2c517---15102695187.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210905194547.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/35307382974.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/72468232947.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/purobabesevowixonitowe.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/filuvad.pdfIn PDF document text
    • http://honda-vo.com/upload/file/pixukofazojizugudifazixi.pdfIn PDF document text
    • http://net-marketing.hu/images/files/sumikeled.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/45802651494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=plants+vs+zombies+2+free+download+for+pc+windows+7PDF 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_off0000cc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2C 17312 bytes
SHA-256: 6b83ca96a67c82665f32cc78c597bccb222831aba9ec378ac3ab92993edc9180
font_01_sfnt_off0000f8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 11304 bytes
SHA-256: 7cebcf793049f178e1942e5eafbe1ba2389bf0ed8d3f73664a3874d92c917753
font_02_sfnt_off0001133c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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