Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54e6f9fe70ebee5…

MALICIOUS

PDF

74.2 KB Created: 2021-03-08 23:28:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bb115869b871674ff2670785f79a5ba SHA-1: 2697fe7fbecdea0cf36c1615eac413fce06c6641 SHA-256: d54e6f9fe70ebee53f5a35c1614df81946c82b491ec6b93e36ef109a2dda10c7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or phishing attempt. One of the primary external links is to 'pelibifir.ru', which is likely part of a phishing or scam operation. Although no scripts were explicitly extracted, the PDF structure and numerous external links indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/wix?keyword=say+it+with+symbols+answers
    • https://levukuwaxumofet.weebly.com/uploads/1/3/1/3/131383949/3665165.pdf
    • https://daputonekamipit.weebly.com/uploads/1/3/0/7/130775603/pezedaxarotuxi.pdf
    • http://123dutch.com/reflections_worksheet_1_geometry_g_answersh6fqv.pdf
    • https://dogerisu.weebly.com/uploads/1/3/0/8/130874322/geputerutevo.pdf
    • https://mibuvenatevuwo.weebly.com/uploads/1/3/4/6/134607329/novafezazazobemodad.pdf
    • http://casserlabs.xyz/vulejubivugumegejipapor6iij.pdf
    • https://cdn-cms.f-static.net/uploads/4464532/normal_603cf520cf967.pdf
    • https://static.s123-cdn-static.com/uploads/4393486/normal_5fdd106b0e1d7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/takurugilij/639608412.pdf
    • https://s3.amazonaws.com/widiku/mujisilujubaluxonugaje.pdf
    • https://uploads.strikinglycdn.com/files/974e131c-3c07-4550-b058-ad30991c5610/online_masters_in_business_analytics_no_gre.pdf
    • https://s3.amazonaws.com/lovetijif/94011671902.pdf
    • https://s3.amazonaws.com/sifawekujiki/73335184595.pdf
    • https://uploads.strikinglycdn.com/files/83544d37-50a8-4860-93a7-9cc858a87ba9/57366626755.pdf
    • https://s3.amazonaws.com/medaliwifufugel/child_psychological_disorders.pdf
    • https://s3.amazonaws.com/taturi/affinity_laws_for_fans.pdf
    • https://s3.amazonaws.com/lanorolowu/unitary_approach_to_industrial_relations.pdf
    • https://s3.amazonaws.com/rafiralexezol/96911841109.pdf
    • https://s3.amazonaws.com/kizugokofo/repair_costs_for_jeep_grand_cherokee.pdf
    • https://s3.amazonaws.com/lofese/free_tv_and_movies_app_for_android.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_off0000e5cc.bin
b22ceb6b1d30ae37ca82d860423d9c701e900a32556efa5b4c8bafb74e8b751d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CC 5360 bytes
font_01_sfnt_off0000f7f0.bin
d27293b545fe986f8c55ed1a303639f647b4d739ab38b5fcb15d4ebe20e4d82a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F0 10364 bytes

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