Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e460f4b7fbc311e…

MALICIOUS

PDF

85.9 KB Created: 2021-04-01 10:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: aac1ce3a29989e94e1f2eed6b7f67d54 SHA-1: 51e2185635c640c9f1057f2e6151172ca68922af SHA-256: 8e460f4b7fbc311e3690f7c1176ed526182ba60a2ccd851486055a7723edbb59
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 0.9995

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://gimoguvi.ru/award?keyword=carbonato+de+litio+mecanismo+de+accion+pdf PDF link annotation
    • https://cdn.sqhk.co/rifojimuna/eggbgfM/91757642056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_600a5ddc8b814.pdfIn PDF document text
    • https://zujetopefij.weebly.com/uploads/1/3/4/7/134766602/ditaladeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407081/normal_605b0f55ef35c.pdfIn PDF document text
    • http://padapup.iblogger.org/cost_estimation_nptel.pdfIn PDF document text
    • https://jimekijan.weebly.com/uploads/1/3/2/8/132815057/wenimibikeva_gafive_vigoxunepivitat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421058/normal_6065169ecbe68.pdfIn PDF document text
    • https://vavujajakakef.weebly.com/uploads/1/3/0/7/130740385/61171ca.pdfIn PDF document text
    • https://zitipijasidigor.weebly.com/uploads/1/3/0/8/130874434/58f191ca.pdfIn PDF document text
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/nimarer.pdfIn PDF document text
    • http://gagipelujer.iblogger.org/casio_sgw_1000_2b_manual.pdfIn PDF document text
    • https://rufufuwoka.weebly.com/uploads/1/3/1/4/131454634/zemafitomedubobo.pdfIn PDF document text
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/temegubetuten.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/hdAidV8/divatusux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366993/normal_5ff3a9824481c.pdfIn PDF document text
    • https://wokawopirajer.weebly.com/uploads/1/3/3/9/133999547/72b8c5a36c.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/UhiAibj/13040636548.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_0be7cf5912c14588894d7f84fe75fd05.pdf?index=trueIn PDF document text
    • https://73ea35ec-f0b0-4773-8bcb-d62b778c7de8.filesusr.com/ugd/a8e976_6bc597bc942a43f6b6d9e824ec02b574.pdf?index=trueIn PDF document text
    • http://dazulenaredon.rf.gd/54112646236.pdfIn PDF document text
    • http://wawanojuvib.rf.gd/helping_and_linking_verbs.pdfIn PDF document text
    • http://momerulazem.rf.gd/essential_korean_words.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_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 5344 bytes
SHA-256: ce60abebdf1ddbf634f71bbda73fa316d9742afddcf471ea4390936971d393ff
font_01_sfnt_off000108ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108ED 12640 bytes
SHA-256: 0c3e3cdda84871e64db2160e9fcd9a5df315a63ad26b4496362ced8b3e01a6f1
font_02_sfnt_off0001327b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327B 16260 bytes
SHA-256: 16d3f8655114d0902318f1a45715520560773d3bf5e390d74f207be828cb3ad7