Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5330f3bdb9890f…

MALICIOUS

PDF

74.4 KB Created: 2021-03-01 19:06:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 57097d6ec9dee1bdadb4bee1a0d668d4 SHA-1: cd510962134e15b294625a985d2446f558fa7415 SHA-256: ba5330f3bdb9890f41095f9b53977119a358dc8827b3722f142d0db6c3f4db1e
134 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host many links on potentially untrusted infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/aws?utm_term=xbox+360+tray+won%2527t+eject PDF link annotation
    • https://balijijileg.weebly.com/uploads/1/3/4/5/134505585/kofututowujuz_zisibokik.pdfIn PDF document text
    • https://cdn.sqhk.co/somepizeko/gfEgcjd/easy_language_translator_apk.pdfIn PDF document text
    • http://bigmagazin.xyz/naturalization_act_of_1790_and_1795lk6qg.pdfIn PDF document text
    • https://cdn.sqhk.co/fodumisux/jhg2gd5/85766553758.pdfIn PDF document text
    • http://c-advance.space/woodworking_jointsmrsvv.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/risuritadun.pdfIn PDF document text
    • http://givupuxorow.iblogger.org/how_long_is_a_primary_medical_cert_valid_for.pdfIn PDF document text
    • http://mynasert.online/purpose_driven_life_audiobookkkctt.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/idmgcd7/37546065245.pdfIn PDF document text
    • http://bovosidifusu.iblogger.org/24766861194.pdfIn PDF document text
    • https://fojiwuduz.weebly.com/uploads/1/3/5/3/135309278/c17e91e97.pdfIn PDF document text
    • http://nijalatol.mypressonline.com/h81m-p33_audio_driver.pdfIn PDF document text
    • http://optamorem.com/86446959617046ez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/maya_banks_kgi_series_in_reading_order.pdfIn PDF document text
    • http://debarunuzijabe.rf.gd/vokelowajekajavanenefe.pdfIn PDF document text
    • http://vuvuparitika.rf.gd/cub_cadet_ltx_1042_kw_owners_manual.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_off0000e5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 5532 bytes
SHA-256: 1061ad7217ba1caa4069a830effdec23c9f443c9e3e6ee6c69859f2bc00a4be2
font_01_sfnt_off0000f8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 10460 bytes
SHA-256: df08012c42f72069eb5016b19f29344a88ec130cf6e8d73756ebe6a6289612b3

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