Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e4189ed06e39fe…

MALICIOUS

PDF

88.4 KB Created: 2021-10-06 00:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5cc343b859814e1f60427b9300fd320 SHA-1: 7505085b6339c22e342bb0bd3c6b04a496a22b6f SHA-256: a5e4189ed06e39fec5fd70a710cec2f0ea1cbc6183f24c4b65d5ca547d4458d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://garglob.ru/uplcv?utm_term=aerobatic+planes+for+sale PDF link annotation
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c5a2b260c---kedixaxezo.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/fuzubatovuwozudalurosar.pdfIn PDF document text
    • http://dentherapia.hu/files/file/pasoxokojalikajufanonoxu.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/raxar.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/40390361172.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210916070613.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/xofovevizevanukugikokami.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/wuzaluzitejemagedirujida.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/lejifuvedixokot.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/jafofosuwosobojekupex.pdfIn PDF document text
    • https://jin-ji.com/upload/files/nutusufo.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/29246356964.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/labokumu.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/nafiz.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/borijaludo.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/jadawupibuduxepepud.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/38385792229.pdfIn PDF document text
    • https://musluogluotomotiv.com/upload/ckfinder/files/fifokogobimuk.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/50462297224.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/32402236600.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/mebesoziwegonuxotekawe.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/zilepofix.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/xizadizonebarapifodego.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109082210491095.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/60105264776.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/11300208352.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/wiwakupudelowojope.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_off0000f3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 18320 bytes
SHA-256: 390caeb0f0dd0e2d4af751a1bb18d08922702565cd3f777068db79ce4327838a
font_01_sfnt_off000123b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC9 10596 bytes
SHA-256: 894f2dbc58f58e2b07ad2fb76aa560d0f78fcb216ef66bedf38715b3cb369f24