Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbc0571c00c596a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-21 05:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b3ec47ab57d2fd0aca0989ddda9052b SHA-1: 022cbd8ce3739c829b5fb75df7c7cbf58a4dca07 SHA-256: efbc0571c00c596a869ae9d49375f7f4646afc211dbc6858009c61557200d981
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable hosting and redirectors, characteristic of phishing or malware distribution schemes. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, further supporting this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=facebook+messenger+android+source+code PDF link annotation
    • https://vietnaminsight.biz/ckfinder/userfiles/files/kukogakotipuras.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/xegesorinivoj.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/xojirutetifu.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/xineted.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/fikozujib.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161436e9e4e5c2---gexirekoxegilexepifen.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/87060437379.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/junidejulijusazaf.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/69626999204.pdfIn PDF document text
    • http://szjg.hu/images/file/10047557642.pdfIn PDF document text
    • http://upakuika.com/img/file/zopifukuvidewuralimakixa.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/20219151933413668.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/xuroxefexujavaxemofevaj.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e6d6d6935---mavufumuluxenedutire.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/gamavul.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/40161870130.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/gulawerevepezadepidutas.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/58155206360.pdfIn PDF document text
    • http://teplospectr.ru/images/files/jufezugeviduru.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/bikupapot.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/mulut.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/valekufalitoxewuguvuzopal.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/52209215431.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_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA85 10876 bytes
SHA-256: f380d10789a4c277597ba94221da18b36fa2c0ea182d4db961a164731c7987de
font_02_sfnt_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 18156 bytes
SHA-256: 998c66aeb8f70849897d3b16a399d9b52cc8cbb581ecb0d145392519049d721a

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