Malicious PDF — malware analysis report

Static analysis result for SHA-256 19110a08be2e731b…

MALICIOUS

PDF

86.3 KB Created: 2021-09-22 14:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 62e36f11679adce987fa0a9ae497af67 SHA-1: e8ad4ad05d23c088332923e74110ed321365be09 SHA-256: 19110a08be2e731b01f21c6c37bc819c97e4aad8c579eb368f7180701808bb6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://espritgt.com/userfiles/file/gosujenasifigubaleserobin.pdf In PDF document text
    • https://pabxlg.com/userfiles/file/5988073248.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/95821972499.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/5363797418.pdfIn PDF document text
    • https://panama4d.com/contents/files/tilekuxewuvukufamoxunika.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/74444314691.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/tudof.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210906_100040.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/negeduraremu.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/6100154306.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/53910928110.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/liwupiserofalesokoloroke.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/nonabo.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/pesiwajufomedebidude.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/firaxaxajedozisuzafi.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/zepanon.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/75774468093.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/butimunidiwepimuze.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/kagisawenolimabekubeba.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/74510705512.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/jajewenavodid.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc5d84bbd---rupazaxizaderet.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/2345034885.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/78030451362.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/wagajepijeterotuzuwowezu.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/navidenimajibovizikapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=combustion+reaction+of+isopropyl+alcoholPDF 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_off0000ea08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA08 11132 bytes
SHA-256: bfa119277a4a72d8ba017e71173f1a5e26113ed9c310f7b89a9ff7ec2b9c313a
font_01_sfnt_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 18316 bytes
SHA-256: 0129df73f82f29b29af2d924b8320b483a67d093b881257b17c05d7da7c98606
font_02_sfnt_off00013335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1