Malicious PDF — malware analysis report

Static analysis result for SHA-256 5483f38d2c939175…

MALICIOUS

PDF

139.7 KB Created: 2021-03-04 15:47:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c4d54429dd6d60ffa3c65e3e67161013 SHA-1: d473e71786d5f9f039a8676dfde19cbded3cd08f SHA-256: 5483f38d2c93917596a8e5bd3cf1f55d61f2199f5e973d29170fd1916b20c3f3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • 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://resalured.ru/strik?utm_term=how+much+does+a+pole+vaulter+make PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426421/normal_5fee49f3d8a07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_601f67c316a2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379969/normal_5ff140d0b5e27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408862/normal_5fe00ea06912f.pdfIn PDF document text
    • http://gijutudubesakuz.iblogger.org/scouts_and_guides_uniform_shop_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390373/normal_6004970880850.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417119/normal_5fc89366d792b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_5fc86f4975779.pdfIn PDF document text
    • http://wotaxatumumodok.sportsontheweb.net/damubu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368492/normal_6006a34b62d6c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wumafopid.onlinewebshop.net/is_sword_art_online_alicization_lycoris_multiplayer.pdfIn PDF document text
    • http://sejixopur.rf.gd/equivalence_class_example.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/20848323790.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/9754093668.pdfIn PDF document text
    • http://rowoniwetob.atwebpages.com/iowa_code_714.16.pdfIn PDF document text
    • http://pepuzawataguzaw.rf.gd/23543951485.pdfIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_05b6173cd5584e91bf8b95d99b499b13.pdf?index=trueIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_6e1778e5c17144d2b23e295991334d23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/bhikari_film_video_song.pdfIn PDF document text
    • http://xatowumo.epizy.com/narotugaru.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/age_of_sigmar_point_changes_2020.pdfIn PDF document text
    • http://bomepexajusopa.epizy.com/alain_passard_cookbook.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C064 5216 bytes
SHA-256: d81b0e7d9a03dc5ce40414b3139d5cd8cdf66572fea2c2e4ab66a356d3ea67cb
font_01_sfnt_off0001d239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D239 13936 bytes
SHA-256: 9ae22601b2e84643cb51cef377e80c3c61b57cc8e1207d616417452b99f8539c
font_02_sfnt_off0001fdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FDD7 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727
font_03_sfnt_off0002126a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2126A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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