Malicious PDF — malware analysis report

Static analysis result for SHA-256 673d705d02fc3b52…

MALICIOUS

PDF

78.9 KB Created: 2021-09-20 11:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 41534bb940f34b2651939bd2a7717c35 SHA-1: ac2900021754cbac8f141e5b3dcefbaf6700cf8a SHA-256: 673d705d02fc3b52e485efd07afd073b041db3e3cd450dae07ddfe38e34c305e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a significant number pointing to disposable or suspicious domains, characteristic of a link farm used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf275b1a3---16692430081.pdf In PDF document text
    • http://xn--80aa5alfu.kz/file/29738031637.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210911_115CD5A2E0BDA8D9.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/betipivuzavubojewazo.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/98243901802.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/15024823648.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/fonavan.pdfIn PDF document text
    • http://a-pluset.com/userfiles/8482610803.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/kotif.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/75878382202.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/vivumogilazonisado.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/sexubevasexodulekupofafe.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-18/20210918125850151997.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/boritovanedil.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcba6b2119---sojuziwidejana.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/38144622041.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/lisodosijaditikozax.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/nigonezuti.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/38913203516.pdfIn PDF document text
    • https://majubesar.net/contents/files/mujawubalevabobusujijis.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/77780448241.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rasoberorelabipoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ski+tracks+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_off0000d1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 10352 bytes
SHA-256: 83ba2a362ace5ead0fdd354eefa85e0748aff30e9b66c96ccdcfc5bff5cea117
font_02_sfnt_off00010177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10177 17244 bytes
SHA-256: ae918b8207987658a4da9c9d38ccbde1c8cd67b37d1b328b7faac98fa8dcc5bb