Malicious PDF — malware analysis report

Static analysis result for SHA-256 685e25ba994705f3…

MALICIOUS

PDF

99.7 KB Created: 2021-05-06 03:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c5334b4b8e238a6bfacce3e4525ba4b SHA-1: 7c9db1f9b2acc388835211677e7d94fd9d40d704 SHA-256: 685e25ba994705f3cda09e5bb743ca89184057a7b9efa9909ba2a6da302269dc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external URLs points to a watering hole or phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/strik?utm_term=black+ice+key+and+peele+transcript
    • http://nevidulipegu.22web.org/jazoreke.pdf
    • https://tagipuzato.weebly.com/uploads/1/3/0/7/130776724/4472628.pdf
    • http://zegevuk.22web.org/zuvufitobegixowoxolobixuv.pdf
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/xewanojejapesa.pdf
    • http://madawuboso.sportsontheweb.net/electronic_projects_for_engineering_students.pdf
    • https://wutuzorul.weebly.com/uploads/1/3/5/9/135963099/tesepop-bokonip-tenoguxi-kivofadu.pdf
    • http://kopalirigel.mypressonline.com/english_grammar_auxiliary_verbs.pdf
    • http://bazorapugaji.iblogger.org/public_speaking_skills_books.pdf
    • http://auto-agents.space/90903469126se4nm.pdf
    • http://galoomer.online/this_modern_love_lyrics_deutschatyru.pdf
    • http://allostar.buzz/what_is_a_gy6tt2cn.pdf
    • https://neruzubegakakew.weebly.com/uploads/1/3/4/0/134017499/karobuletati_meguvoxavaji_livoxasumasovip_sadadawa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fededajuna.rf.gd/31696168049.pdf
    • http://bexukavibume.myartsonline.com/conditional_probability_two_way_table_worksheet_answer_key.pdf
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_ccc206737c0f4d43be0148d03dbfdb90.pdf?index=true
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_b178dc05bda447d1af42a4f45dd2bf66.pdf?index=true
    • https://s3.amazonaws.com/dadupawo/failed_c_ngha_l_g.pdf
    • https://s3.amazonaws.com/medaliwifufugel/auto_signal_refresher_apk.pdf
    • http://xatonidimo.rf.gd/aarakshan_movie_720p_hd.pdf
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_75bee0eadbbd45fc9d9c3e79f10f36f1.pdf?index=true
    • https://s3.amazonaws.com/fovezewi/wulusaxibegasosodojapama.pdf
    • https://s3.amazonaws.com/sagotomagin/kutty_movies_collection_2019_free.pdf
    • https://19a4122d-28db-4ec2-a9e3-8c1e87f24dd5.filesusr.com/ugd/70d0b7_56b558193e5e42b9a91e4b4ddec94f02.pdf?index=true
    • 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_off000146ac.bin
5f70e0f7eef1229da6a7f82467c01601395a0ec69ae1604508db3e2730247e8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146AC 5280 bytes
font_01_sfnt_off000158bb.bin
f865e0608654a1362c9e5baf9d427316af9d76186b4f65eae36fb5adfaef89ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x158BB 12096 bytes

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