Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4553c096d65c691…

MALICIOUS

PDF

86.3 KB Created: 2021-09-22 23:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: edd2d7d4c4d233f16a80a8fb0cbc5d18 SHA-1: 484d147d337478581eafb8472481d1f17d0a19a1 SHA-256: a4553c096d65c69194e18c644cceceeabe21aae67c33e4b52a20b8db78bc5c28
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. The PDF contains numerous links to disposable domains, consistent with a link farm used for phishing or distributing further malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://aczv.fr/userfiles/file/22284544878.pdf In PDF document text
    • https://ecoolteh.eu/galeria/file/kajuvopufipodivexereziva.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/niruxip.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/96400631951.pdfIn PDF document text
    • https://izometal.net/mm/file/bevupeviwezezabegavifusej.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/14318010008.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/fudumomiwanituw.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/11549378388.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/vumolarinekekarumu.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/91872772431.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/luxewiraki.pdfIn PDF document text
    • http://cissi.it/userfiles/files/94008364452.pdfIn PDF document text
    • https://cakkue.com/contents/files/pevugegixosetun.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/25598224955.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/24265149236.pdfIn PDF document text
    • http://keyday.ru/files/files/pimazan.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/davepinujeretujoz.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/wafew.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/vigedaduxefazinegeg.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/59213638940.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613270f3138aa---xiwanag.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd7ccb7dc---21643182524.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/9583787948.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/49085940693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=best+hd+offline+games+for+androidPDF 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_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 10852 bytes
SHA-256: a68dea9eb995805b186b94ac6e148b66349325c60778cc516ce9aeb1c091a830
font_02_sfnt_off00011fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FED 16752 bytes
SHA-256: 9739b039f00aaeb8414f9166bfea40004c03ac52d6b37bf210eff9a9f1ffe26f

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