Malicious PDF — malware analysis report

Static analysis result for SHA-256 749e54afb3d85ce2…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 18:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 126f0dcf59eb8cc1738af7ebd401a645 SHA-1: eb869094fde2e314e722057b368158ada994f119 SHA-256: 749e54afb3d85ce2b5fbf7dfdce7464914a075fee8a4ebc35bc7c474ae31a33e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs that function as a link farm, with one prominent URL suggesting a lure for game downloads. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common vector for malicious PDFs to execute further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://medvor.ru/uplcv?utm_term=gta+v+offline+free+download+for+android PDF link annotation
    • https://osikovo.eu/webroot/img/content/files/94690005799.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/69559970583.pdfIn PDF document text
    • http://sireny.net/share/files/lejaputitozidumusaza.pdfIn PDF document text
    • https://yasacompany.com/upload/files/desaxadi.pdfIn PDF document text
    • https://pellevah.com/upload/files/89203913616.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/80695038766.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/ninub.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/14623907463.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/92795418421.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/pimomamigatogesogi.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/30922077979.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/79781793137.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/noterazuwa.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/18546198523.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/74801329355.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/79106805941.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/91139931467.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613626a18dc00---gefazawababojug.pdfIn PDF document text
    • http://rem-proekt.com/f/file/99587421506.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/poguriga.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/disigavugekak.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021091013124173499.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///muvinofaloxuxofifoga.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_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 10368 bytes
SHA-256: 20b572044eaaa919b5b6d83ef8ff5ea52b21fc4397b231a4db5118e6df8d695b
font_02_sfnt_off0001080c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 17536 bytes
SHA-256: 5a2df35254c28fab3765f67ab24e40952799ca934880789c5cd9272386c339d4

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