Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7cc8423dd08ab67…

MALICIOUS

PDF

73.0 KB Created: 2021-09-17 09:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4520ac6d354a0654c5ea993c07f6b359 SHA-1: 34daf3e8c0ab7b2e5328fddde540acec616cd5e7 SHA-256: c7cc8423dd08ab67d369a45468dc10e25dec694b0cd29913b0929bf1a78c1ea2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, likely for phishing or malware distribution. The presence of many unknown URLs suggests a broad campaign to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://giaynangchieucao.com/userfiles/file/89767255410.pdf In PDF document text
    • https://abzesolar.com/uploads/files/gadufobomikupagisuxo.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/60816071044.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/gijuxu.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/89817163984.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/gumewerikuwalemabojeleli.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/xolajobajodunot.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/88017245232.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/sulovur.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///38515496816.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/1956386425.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://lapawan15.com/shop/fck_file/file/lixaxatezozizegofomogob.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/86655006620.pdfIn PDF document text
    • http://speckrepej.com/upload/file/74081883054.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/15031004008.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/xuzemomo.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/5967672216.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/12208280059.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/45728372634.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/17158921441.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/70840716663.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/6907826242.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109041052586338.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/83520269865.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e1abb005d2072bbb16ac4327e03078d1/65700174058.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/bisugemunetipugegemez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=online+imposter+gamePDF 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_off0000be39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE39 15748 bytes
SHA-256: 4da5d3bdf5b57ad2cb71402b16492af0d1269a8cd0cf742df9044262820ecc08
font_01_sfnt_off0000e606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1D 10620 bytes
SHA-256: 73dc5d60bc8e99635568766c1f76b711c626f0b76f553c21ed18bffd7fd4d55f