Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67e9849c351d4df…

MALICIOUS

PDF

75.6 KB Created: 2021-04-01 22:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4523d5bd50079dabf5e1cff4aec0d02d SHA-1: c7aa6cd83015a20d23d258356ef4c64c774dd4cf SHA-256: a67e9849c351d4df34d1d002729a672e0f670a06ee257770f98e95e548261a02
206 Risk Score

Malware Insights

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

The PDF contains a malformed exploit stream and a large number of external links, indicating it functions as a link farm. The embedded URLs, such as https://baarspo.ru/award?keyword=latinoamerica+definicion+pdf, suggest a phishing or ad-revenue generation scheme. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://baarspo.ru/award?keyword=latinoamerica+definicion+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462696/normal_6046ee75cf325.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/aqjbgic/gold_rush_mines_in_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/fabokofe/jeWihid/9756673064.pdfIn PDF document text
    • http://kuxufijum.iblogger.org/pitabifosul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458616/normal_603d7c8170827.pdfIn PDF document text
    • https://jesodiretax.weebly.com/uploads/1/3/4/6/134659119/8206260.pdfIn PDF document text
    • https://cdn.sqhk.co/samigimas/dCjfggi/rice_tungro_bacilliform_virus_promoter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_603419f10441f.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/ejgKIhH/21645440256.pdfIn PDF document text
    • https://xadutodibuj.weebly.com/uploads/1/3/1/1/131164520/2072486.pdfIn PDF document text
    • https://cdn.sqhk.co/rerupovev/9jeSjjc/enchanting_guide_eso_leveling.pdfIn PDF document text
    • https://sobopagugakevul.weebly.com/uploads/1/3/4/8/134881985/1272e612.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vodesoxiside.rf.gd/10709193511.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_50164015663546dcad2903766a9e29b8.pdf?index=trueIn PDF document text
    • http://farujage.epizy.com/nanda_diagnosis_list_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/68252189018.pdfIn PDF document text
    • http://rabibunipidozok.epizy.com/3ds_max_architecture_tutorials.pdfIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_aaaab754ca894625b8375856f4d1dde2.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 5032 bytes
SHA-256: 03827c716aa0c283e6c4c6f7800e222b519387b6612b5ce456ca41709127e2db
font_01_sfnt_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 12592 bytes
SHA-256: 9c53b4edbbb9280cc61a8db634a0a84397ca95413086da47a1861d3db57f80ae

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