Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05c4e2ac6373075…

MALICIOUS

PDF

76.6 KB Created: 2021-04-03 14:39:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dee6fda98734d70a850f4416c01086c SHA-1: 27fd12a9abd1bfc596bf264dd2435600480d9931 SHA-256: b05c4e2ac6373075961d9caa8db6b044edb251af686759c3a1c6c6225a3484b4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/aws?utm_term=apollo+twin+price+malaysia
    • https://surugodinatuv.weebly.com/uploads/1/3/4/8/134861851/wejerejefe-kixitoxevidor-kokize-kikabelo.pdf
    • https://jabukosiw.weebly.com/uploads/1/3/0/8/130874379/jiwabuxovowobu.pdf
    • http://vvinorama.fun/taxeropevorinetepoz9xdn.pdf
    • http://narovomesizi.medianewsonline.com/sidozisirufona.pdf
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/1181701.pdf
    • https://cdn-cms.f-static.net/uploads/4366665/normal_60527df77fab7.pdf
    • https://kaxemesotom.weebly.com/uploads/1/3/4/7/134732336/3491171.pdf
    • https://vewefididijos.weebly.com/uploads/1/3/4/5/134517371/xuzilis_xevamotilo.pdf
    • https://dajoromu.weebly.com/uploads/1/3/4/3/134309711/171cbc90d.pdf
    • https://zekigoduse.weebly.com/uploads/1/3/4/3/134336209/3358426.pdf
    • http://natural-shop.info/843081590421h9ou.pdf
    • https://tevupuzenoxa.weebly.com/uploads/1/3/6/0/136009769/8699951.pdf
    • https://cdn-cms.f-static.net/uploads/4425504/normal_602d00cf9aadb.pdf
    • https://cdn-cms.f-static.net/uploads/4408984/normal_5fda84319f354.pdf
    • https://wesaxewotivaf.weebly.com/uploads/1/3/4/5/134578523/witoguzitenibakale.pdf
    • http://xakidofe.sportsontheweb.net/list_of_healing_scriptures.pdf
    • https://vixawesomuwevu.weebly.com/uploads/1/3/5/3/135387162/molife.pdf
    • http://game-pro.xyz/61636791018acrt5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kikanelomer.onlinewebshop.net/zawarifegidofemagasuwisor.pdf
    • https://uploads.strikinglycdn.com/files/1967e557-4e1c-456f-9625-a4d33a74e144/how_to_identify_grammatical_errors_in_sentences.pdf
    • https://uploads.strikinglycdn.com/files/226c349e-6376-4737-ab71-a7e840ad7286/33592676976.pdf
    • https://uploads.strikinglycdn.com/files/b142f129-0e84-46e7-b595-12ae60ea335d/what_does_the_narcotics_anonymous_symbol_mean.pdf
    • https://uploads.strikinglycdn.com/files/372dc768-c8cd-49d1-a1a7-4a92fa033931/47432494726.pdf
    • 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_off0000ec59.bin
d1eeab3485e1b21aea3ba704bfc54d53c9ff96f4adb8b6dd996d02f07e26050b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC59 5260 bytes
font_01_sfnt_off0000fe3b.bin
6329034b801f57020d1032f62c93962b38084ff2751a48df1379b62fa0e131ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 11652 bytes

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