Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a534ea7d438439…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 21:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 7945c33a9ccfd408ff49d23829a618db SHA-1: 469bebe7b545c011475625b33778c516584dcfae SHA-256: 34a534ea7d4384398ae57d8d317d8326a49edb09e481780f9012b745c1dfa4ca
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to unknown domains, suggesting an attempt to redirect users to malicious sites. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates the presence of command-line execution tokens within the document text, further supporting a malicious intent to potentially download or execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://badrivishal.com/media/19805791114.pdf In PDF document text
    • http://ediljolli.com/userfiles/files/tozexunib.pdfIn PDF document text
    • http://qdcmd.com/data/files/85586312270.pdfIn PDF document text
    • http://le383.com/uploads/files/66108600488.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/15230299420.pdfIn macro / runtime command snippet
    • https://diphong.com/uploads/donibaluvoji.pdfIn macro / runtime command snippet
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/93476617287.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/76455460830.pdfIn PDF document text
    • http://sns.hu/_user/file/sujuzaju.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/nejodabajunovituseziva.pdfIn PDF document text
    • http://bronia.org/userfiles/file/somonet.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/witadonodiwi.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/4696763053.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/gutadaf.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/38486218918.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/konokoxilolekupana.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/53967763595.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210910192041_o2hv68.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/ruregiv.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/diwaxodepowosaz.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109111544472673.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/67166722543.pdfIn PDF document text
    • http://le383.com/uploads/In macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+gallery+vault+app+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_off0000dca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 11004 bytes
SHA-256: e10e0fcaa7d33fea484e173b808b6be39623abda410cb5dc9dc533fef49e9176
font_01_sfnt_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4B 17568 bytes
SHA-256: 590229ad45b897588969917696618b67dbaaee4d76c013a55f03d5d23ea6824d