Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7728e0ddd6c208…

MALICIOUS

PDF

80.9 KB Created: 2021-02-26 07:27:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cd3e33f332841859ad4b99a4e7f764b9 SHA-1: 7bf9753625ed9ca7bb362df50c9057fa13d23f40 SHA-256: fd7728e0ddd6c208bc3fa2ae94cf15fd64e1b4d8969bc9817ea0c752638cf14c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely spearphishing.

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
  • 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://jottigo.ru/award?keyword=balzac+and+the+little+chinese+seamstress+movie+online PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392658/normal_5ffe254f8b5a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380083/normal_600534a326584.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/v3gihik/wrecked_island_survival_sim_1._060_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/kiijaTM/nick_jonas_kingdom_character.pdfIn PDF document text
    • https://cdn.sqhk.co/goganededem/gBPgdBf/oldies_love_songs_offline_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mejofiwog/ihaShcA/19522200102.pdfIn PDF document text
    • http://zizuvipo.iblogger.org/63033913737.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/bahubali_picture_full_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/ajooba_movie_free_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/8645731543.pdfIn PDF document text
    • http://dadojusox.epizy.com/dujorodojavamejowa.pdfIn PDF document text
    • http://pepezuvizomu.rf.gd/gepevamipifon.pdfIn PDF document text
    • http://jirizaxewusi.epizy.com/jawebifubum.pdfIn PDF document text
    • http://zuzasuzojenox.epizy.com/computer_all_shortcut_keys_gujarati.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 6524 bytes
SHA-256: 78aeb624d06de161445ca4f78958e93bbb144e2112b58d644b73f8c4da8a16ff
font_01_sfnt_off0000fe4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4F 5340 bytes
SHA-256: 0d7e2813c1e9e62453e0b4a4beed06bd1e7c54e48ae2564eabbd8ee44f3d9777
font_02_sfnt_off00011052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11052 11060 bytes
SHA-256: 811298797f80cfaea9a391a96f62ae9a68ab580b1b78e10b41312a6119f5ce54

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