Malicious PDF — malware analysis report

Static analysis result for SHA-256 191162e9ebee5a29…

MALICIOUS

PDF

90.9 KB Created: 2021-04-02 12:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: eac9d7416edb6567339fe37daa433899 SHA-1: a3c077480927a2ac70be87d03a8019f544625144 SHA-256: 191162e9ebee5a299d89a83c852a90d5c17a0f6adf7d0273922a959d84f541ad
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/wix?keyword=algebra+2+introduction+to+polynomials+worksheet PDF link annotation
    • https://kerijene.weebly.com/uploads/1/3/4/3/134367262/fovaguwunojuwu_terab_seripakukako_nimonomed.pdfIn PDF document text
    • https://fobujetomifaj.weebly.com/uploads/1/3/4/7/134765034/kesaxulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387582/normal_5fdb958738e1f.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/8965551.pdfIn PDF document text
    • https://gubaxefu.weebly.com/uploads/1/3/4/5/134592394/vuvepebemitiraz-nufaki.pdfIn PDF document text
    • https://runidodejifam.weebly.com/uploads/1/3/4/0/134040950/boxugoxuvivafos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_6010f7bca244f.pdfIn PDF document text
    • https://lakiliwurig.weebly.com/uploads/1/3/6/0/136089988/ac7bae185ff1a.pdfIn PDF document text
    • https://guwepejesa.weebly.com/uploads/1/3/2/8/132814432/3917696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460954/normal_6049463d8503e.pdfIn PDF document text
    • https://wuvibimujefo.weebly.com/uploads/1/3/4/7/134705329/6708174.pdfIn PDF document text
    • https://kijeluve.weebly.com/uploads/1/3/4/2/134266469/293281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459166/normal_601f214561bd3.pdfIn PDF document text
    • https://poxolegap.weebly.com/uploads/1/3/1/0/131069824/1347220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480149/normal_5fd23bd550cad.pdfIn PDF document text
    • https://kifeketefisub.weebly.com/uploads/1/3/5/3/135347095/pojoga-muxoduvimosu-nitolonijuneta.pdfIn PDF document text
    • https://morurotefat.weebly.com/uploads/1/3/4/3/134317018/9c750b3ff2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lanaladu/95859463130.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/36308427701.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/45771216906.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off00010d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D97 6004 bytes
SHA-256: dbb553a7f6c4d975049d440b853b3f6551d9e9c795449c6f247988689b480fb4
font_01_sfnt_off000121f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F3 10868 bytes
SHA-256: 84b0822d92068a0af43290da73edad67d54165b7bd0577d846560e88b267ef84
font_02_sfnt_off0001473a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473A 16356 bytes
SHA-256: a5337a003b0b8ca27ae5748cb4371390c854405128ded512e85157f8fe78d6e3