Malicious PDF — malware analysis report

Static analysis result for SHA-256 719f279c7bc65664…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 15:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b203658296b80a819f3d87fc4faa3f3 SHA-1: e846e7aba433033058b269666501e1d48a059c73 SHA-256: 719f279c7bc656648fb5b6f702776a198a2407fed163723c72ec62c33ba6ec7d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm heuristic point towards an attack pattern focused on redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://tbm-mova.by/images_from_html_editor/file/12489746293.pdf
    • https://svezadjecu.me/userfiles/file/wuwebopofok.pdf
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/59770929663.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f70751df3---zefenarewuriposun.pdf
    • http://pushgroup.lv/userfiles/files/73474458541.pdf
    • http://enjoybowlramenandpoke.com/uploads/files/juwarimukikusajivusujate.pdf
    • http://khiensa.com/UserFiles/File/5021907884.pdf
    • http://skyrybupaslaugos.lt/uploads/files/tafipatititefavewopida.pdf
    • https://electrodomesticaruano.com/images/ckfinder/files/jawaguzinuremerakok.pdf
    • http://antonellascarpittadesigner.it/userfiles/files/tefexoxifotofurixalapu.pdf
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/rakezujemiwi.pdf
    • http://myblindz.com/fck_user_files/file/63229326434.pdf
    • http://marinapogon.pl/upload/file/savuketep.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414622f0653---56301174506.pdf
    • https://skillmapmagazine.com/ckfinder/userfiles/files/99779730548.pdf
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/fikatasemotawiz.pdf
    • https://drhuanghair.com/uploads/files/202109071217186481.pdf
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/jexexotagipol.pdf
    • http://slkuang.com/v15/Upload/file/20219171114525806.pdf
    • https://aayams.com/userfiles/file/fosajofigexidoz.pdf
    • https://saigonservices.vn/images/uploads/files/77881277622.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mortal+kombat+x+hack+apk+unlimited+souls
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d336.bin
c71b0ad41634d324f7ff29abda8468018cdc2d3596a09f745b8a5e594c289826		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD336 18120 bytes
font_01_sfnt_off0001022e.bin
e833e819c69506a04657b013e477598b477655b1c5e1a4717de72892936993ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 11204 bytes
font_02_sfnt_off00011c01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C01 16792 bytes

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