Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2faaf524ff9c1f…

MALICIOUS

PDF

74.6 KB Created: 2021-02-13 10:28:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9303b670d4c0314e4b4ee03bc5e6735e SHA-1: d3e6d3ceb42d9cc7422249d81ae20b0ab21c0061 SHA-256: 8c2faaf524ff9c1fa28893bb3eb22600c0e357d1a2e9ad972b0d664f940377d0
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 exhibiting link farm characteristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely leveraging T1566.001 for delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=likes+and+dislikes+of+a+girl PDF link annotation
    • http://bonboxstudio.com/1350130326g82ob.pdfIn PDF document text
    • https://cdn.sqhk.co/kerodamajop/jiiagfQ/92577396098.pdfIn PDF document text
    • http://fly-drive.online/870804463971mtks.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/hgfjehj/download_emancy_borderline_war_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jagakutojut/ggsZTia/pusukixaxuxolur.pdfIn PDF document text
    • http://jevijuratovate.22web.org/majibomanezufena.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/biePMyd/cuisinart_ice_cream_maker_recipes_vanilla_custard.pdfIn PDF document text
    • http://kebotup.66ghz.com/asus_chromebook_c223na_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366627/normal_6011eaf9d4f43.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/cNCggI7/fedinebaxulubedopako.pdfIn PDF document text
    • http://normab-id.com/5_steps_to_a_5_ap_english_language_2soh30.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/gfHVig9/parachute_sheets_thread_count.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/ia6LvG5/pizavidobumaxutesukula.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/9fLAha2/bucket_list_movie_star_cast.pdfIn PDF document text
    • http://letxxnx.org/77233577756pu78p.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/simujix/hum_hain_bemisal_full_movie_480p.pdfIn PDF document text
    • http://xusemud.epizy.com/giralejadinej.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/50769021375.pdfIn PDF document text
    • http://widafasamuj.epizy.com/xomikapegileme.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/80909803358.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 5080 bytes
SHA-256: e78ade9898b6e4c65f0e28be10876381ea19919b316b7b6c4b265b104306a5d5
font_01_sfnt_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 10952 bytes
SHA-256: 87b68ac83f8c82b66cfa40a7f071ec7e09ca9f5ed7f6353f5fec153c58655f87

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