Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74414ea9cf16e5f…

MALICIOUS

PDF

72.8 KB Created: 2021-04-30 21:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7d2247e8d5515f9b663337599073e9e8 SHA-1: bcaa698344cb925b46d618812d60d7b313283405 SHA-256: f74414ea9cf16e5fb9dbed24bd5aee22f9ed00615d9d77a69aab85c50847d2d3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and the link farm heuristic point towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=does+a+dryer+have+a+reset+button PDF link annotation
    • http://togezapavux.iblogger.org/giwusefumuvagojalisojo.pdfIn PDF document text
    • http://pogolaf.iblogger.org/fel_la_la_land_actors_names.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/29281644704.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/how_long_to_cook_sweet_potatoes_whole.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/geibPgg/whiskware_pancake_art_kit.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/ZSMRjff/18514962880.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/lusixegozos.pdfIn PDF document text
    • https://cdn.sqhk.co/jojipimuve/hbO2ihZ/zitosikuw.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/b5cdifU/wameruzosozikekimuxuvipen.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/i1G0Vtz/solar_system_model_to_scale_distance.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/5ghVHhf/free_download_best_of_90s_english_songs.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/7399552202.pdfIn PDF document text
    • https://cdn.sqhk.co/rotuzuwibi/hhgib2R/viwavojuki.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/iaIifjb/50559077170.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/xBieCPy/rivivawejanokididid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_145ee62502ce4bc4b5689e257999b453.pdf?index=trueIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_c06b678bde104cc6a871e05e917da20b.pdf?index=trueIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_d081311a86894ca69a5bd7085d790288.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_off0000dfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD3 5184 bytes
SHA-256: ca392ec30f5f2f8243c9be16e3d4731b7d597c5260d3f4689d4af34382c653f9
font_01_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 10844 bytes
SHA-256: df7c7873dee603144bb61e159172825f314d963a8dcc9c6eba10df46c565bd40

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