Malicious PDF — malware analysis report

Static analysis result for SHA-256 38413426d6ea5476…

MALICIOUS

PDF

85.2 KB Created: 2021-09-22 13:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a84d34d2902b5a23704a563190fb05d0 SHA-1: d2509f1bf85ccd2be9d3dc16a674fe7e757e4b76 SHA-256: 38413426d6ea54767c76597a8a73106a18a13692c63fddff3a80e6b16e2fa862
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to domains that appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of 'utm_term_redirector=True' in one of the URLs further supports the idea of traffic redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pottoka.info/files/galeria/files/dojijumitovemamefadurowe.pdf In PDF document text
    • https://baatco.com/ckfinder/userfiles/files/64997866475.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/87165330970.pdfIn PDF document text
    • http://hoachattn.com/image/files/95398620074.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/42043514789.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/7805313942.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210919064733.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/12633672802.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/47691930434.pdfIn PDF document text
    • http://sungder.com/upload/kaxadu.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/jaziromaxukis.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/70966131533.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/noxogutudiwofabegaju.pdfIn PDF document text
    • https://shibbirs.com/media/files/48657529827.pdfIn PDF document text
    • https://ratosatu.com/contents/files/78670233970.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/11404908230.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/0a620062ee616f238b08b6815ee55b90/tilakuforazi.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/xevovijalizotafuva.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/kapawugeraf.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614096634f918---89408121033.pdfIn PDF document text
    • https://securitydm.com/slicice/file/zusikisuseminege.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/tutatefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=android+podcast+appPDF 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_off0000eb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 10308 bytes
SHA-256: e5c89808f67b835a4d4bc7973998e74e04e49c8a2bb3e6c459ae3c50202d6ff3
font_01_sfnt_off000102d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE7 17168 bytes
SHA-256: b346260d95762ff7cce0b818a988e3b09bff2ae86a1d868eba427c9b09369f1e

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