Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e88fa20c444379c…

MALICIOUS

PDF

64.9 KB Created: 2020-11-25 14:22:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cecc45e5c3bcf155dbc59cc99081296d SHA-1: 92cfaa20e0fcde2a690431c95bcab714ee52c8d0 SHA-256: 1e88fa20c444379c45ba71fae37817fe676d78fd16d0ed52714e31d6070c96f8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. ClamAV also detected this file as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the structure suggests a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/strik?utm_term=parts+of+speech+jeopardy+8th+grade
    • https://cdn-cms.f-static.net/uploads/4501509/normal_5fafa8e605272.pdf
    • https://cdn-cms.f-static.net/uploads/4405674/normal_5f9cdaa483260.pdf
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f876d8faf437.pdf
    • https://cdn-cms.f-static.net/uploads/4369506/normal_5f9b5434e204e.pdf
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5f8a6b0ea3f5a.pdf
    • https://tanezogifa.weebly.com/uploads/1/3/4/3/134321065/lukebigisazida.pdf
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5fba3cb43d90b.pdf
    • https://cdn-cms.f-static.net/uploads/4410191/normal_5fa56e6869078.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9c31c431-d93d-4597-91b3-3bec403a25e0/27903703925.pdf
    • https://s3.amazonaws.com/ninasivol/norwich_ipswich_match_report.pdf
    • https://uploads.strikinglycdn.com/files/e3aeeb9c-3c61-4bd7-acd2-da78d2defaca/vumusogodu.pdf
    • https://uploads.strikinglycdn.com/files/40ec2ebe-c0af-4748-80d6-a52f597bcc63/dezofonuvobaxepu.pdf
    • https://s3.amazonaws.com/nonabafat/adverse_drug_reaction_form.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c031.bin
b62129c1cae5412809e5a469b30a0ab7ab60ef9abdf74395b6d6aa11890e20a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC031 5760 bytes
font_01_sfnt_off0000d3db.bin
daa5ed0fb67140fa8abe1540d335f261b7558260f284839fc056448451169783
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DB 10308 bytes