Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaacff9b2da6d869…

MALICIOUS

PDF

79.2 KB Created: 2021-10-06 06:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 255fa1785b939028651cf275556bd49b SHA-1: 631198154fdb8c96f7e99d2cf20b0bb90ecb1f71 SHA-256: eaacff9b2da6d8690946a67766cab8fb652785afdfc04f23bbb2d28cb4b46c5d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to multiple distinct, potentially disposable domains. While no scripts were explicitly extracted, the presence of numerous embedded URLs points towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://jmyhship.com/uploadfile/files/sedolaj.pdf In PDF document text
    • http://dinhvi5s.com/images/newtech/files/25683175460.pdfIn PDF document text
    • https://drterrace.com/london-100.com/userfiles/file/dunodukizapowoduzapitamu.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/72029831915.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/88629428036.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/28704998237.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/bewajoti.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/xuvukaginutisus.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/82665999962.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/piwatakebej.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/88081007690.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/telinilikage.pdfIn PDF document text
    • https://slicktechproducts.com/newerac2c/userfiles/file/zifurupomenubed.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/60846557293.pdfIn PDF document text
    • http://trivio.it/userfiles/files/zakafukuwesibenefafabo.pdfIn PDF document text
    • https://anup.bo/images/files/regonepidededizejirus.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/65f6897e89f0a8656475f47b8ebc0853/51693837105.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/97901627295.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/86755545540.pdfIn PDF document text
    • http://na3.it/misc/file/40596565384.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/32654139175.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/kadelozidewirixi.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/95395500255.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021928102521831.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/pepisalexusulerazomulunas.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/gesomiwowivujupalopupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=little+italy+pizza+72nd+streetPDF 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_off0000cd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0F 19016 bytes
SHA-256: b41609c994ccae121d9491a2ee021e04386ae39e3c58981e1bcfc7c38f377726
font_01_sfnt_off0000fe5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11674 10564 bytes
SHA-256: 2daa49c6455612f47b2e8d7da24dc3569ce21bd45c3f713b04e63d57917ab93c