Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a725b321ee651b…

MALICIOUS

PDF

85.7 KB Created: 2021-09-20 04:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d7547c8ae97ba710a73af8d0cfc233b0 SHA-1: 02d9451a8155abc3983a11023870dab2e7e71eaa SHA-256: 70a725b321ee651b7dc70f2aeb0465e5e1cadf1e1f948f929f73c585af0a4cac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to external resources. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags the use of multiple distinct hosts and UTM parameters, suggesting a tactic to obscure the true destination or evade detection. While no scripts were explicitly extracted, the nature of the link farm suggests it's designed to lead users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jawarakreasi.com/file/linenigifexevutuvumegu.pdf In PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/92527779784.pdfIn PDF document text
    • https://etadelloro.it/images/file/61707727707.pdfIn PDF document text
    • https://websbag.com/uploads/files/29180281093.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/judodimirexomigo.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/53983981725.pdfIn PDF document text
    • http://dsfly.com/uploads/files/3886601745.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/zesididutiwopiwopi.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/zinavazufatolat.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/natuposev.pdfIn PDF document text
    • http://centronegozi.com/public/leximalaxakogitolila.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/40549573892.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/18514790731.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/85868828013.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/mupituvebivo.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/xugadekonajep.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/derorusugonopal.pdfIn PDF document text
    • http://vinmexindia.com/uploads/27165078461.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/75621191647.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351305cc7c7---kuvekumivagunavotigaz.pdfIn PDF document text
    • http://indemo.pl/Image/files/55950581630.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210915_903B8B1C517C9CEE.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/41800307283.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/rilisa.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/gofisime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=noise+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_off0000ea7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 18056 bytes
SHA-256: 16269bf394f5226f9f2c2c5c768f14bbfd343c3c5bcdd20b1bec8f7f95c793d8
font_02_sfnt_off0001318b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318B 10324 bytes
SHA-256: 3a337147c5e9415f7497462c4f4f1ef2ce45b29c9a99602d9988299e52b3675a