Malicious PDF — malware analysis report

Static analysis result for SHA-256 654e819d8111dc40…

MALICIOUS

PDF

72.3 KB Created: 2021-02-26 10:02:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 73035355f50f0e5f53d0d29189a5efaa SHA-1: b2c38aebdc31913f3d89915d7b8f37611a6b992a SHA-256: 654e819d8111dc40b9ae9dd41d0bbbb5e91b1c926c7a3b5abf3d1f720c8a3dd1
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to a dictionary, which is then used to disguise malicious URLs. The presence of multiple links on disposable hosting further indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=diccionario+de+terminos+literarios+ana+maria+platas+tasende In PDF document text
    • https://cdn.sqhk.co/sigidezok/N9Yhdje/tour_bus_hill_driver_game.pdfIn PDF document text
    • https://zaluzukefajol.weebly.com/uploads/1/3/5/4/135400247/zubuwo.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/hiM3ifJ/56918416054.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459328/normal_5ff7cdd303a01.pdfIn PDF document text
    • https://sujabowumosof.weebly.com/uploads/1/3/1/3/131398195/7705225.pdfIn PDF document text
    • http://kufemotobenin.66ghz.com/xufugirosikijenexesusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406223/normal_5fd62ae3a2cbc.pdfIn PDF document text
    • https://posilukununafux.weebly.com/uploads/1/3/4/4/134498017/dudiwokas.pdfIn PDF document text
    • http://tazogupiwelul.iblogger.org/dujiloxigorigodirumez.pdfIn PDF document text
    • http://loxesitigogu.iblogger.org/wedebenase.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vagaloxesawazo.rf.gd/bowifeg.pdfIn PDF document text
    • http://rabilovobixito.epizy.com/69962262596.pdfIn PDF document text
    • http://lugegurofeso.epizy.com/avast_antivirus_free_trial_90_days.pdfIn PDF document text
    • http://vugozagiduzek.rf.gd/84845296769.pdfIn PDF document text
    • http://zedotedifajo.epizy.com/vildagliptin_metformin_hcl_side_effects.pdfIn PDF document text
    • http://gefuxuxoj.epizy.com/96679859893.pdfIn PDF document text
    • http://jamigiboweb.rf.gd/60321811376.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1F 5220 bytes
SHA-256: 60c5e7505f4f9cef4815cac3e41cf2643dfd6d2fcbf485e815947dc1757f7786
font_01_sfnt_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 11904 bytes
SHA-256: 439c2bf8e0676402d8db3916bbc05c2892155e972a965627b8bd5756317b42da

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