Malicious PDF — malware analysis report

Static analysis result for SHA-256 2987b84e358e1d5f…

MALICIOUS

PDF

69.4 KB Created: 2021-03-04 13:03:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d390408e41d0bfa39c28f93596693884 SHA-1: 48a0c8dbf857728a9f13f769dfa203753e93afe9 SHA-256: 2987b84e358e1d5f1363cc565dc87be4863241dc7f54dfe83da0902a48b439b5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to generator maintenance, likely serving as a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=briggs+and+stratton+2100+series+generator+oil+change PDF link annotation
    • http://dkblogin-de.best/duzorufunijud8mcct.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/vitimobud.pdfIn PDF document text
    • http://tevfikyuce.xyz/south_african_national_antiretroviral_treatment_guidelinesws1fk.pdfIn PDF document text
    • http://bbcua.site/business_strategic_planning_templateti19o.pdfIn PDF document text
    • http://pay-order.info/tejusoganirigesomubsijjk.pdfIn PDF document text
    • http://atlas-copco.su/presto_2000_timed_flow_tap3ec69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_60107b4dc658e.pdfIn PDF document text
    • http://logoped-samara.ru/26200312413ebhu9.pdfIn PDF document text
    • http://islemleriniz.org/kejuduwq02w6.pdfIn PDF document text
    • http://xrootunited.com/free_download_prezi_desktop_pro_full_version_serial_key_crackd3a1p.pdfIn PDF document text
    • http://sevoxotedeki.medianewsonline.com/fevulenilatab.pdfIn PDF document text
    • http://xeeewq.xyz/texte__copier_ce2or7at.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492901/normal_5fcc28f5a8fdc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mupufekugix.epizy.com/92480590833.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_off0000d046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD046 5576 bytes
SHA-256: 7e7ecb5e06c142abed46c084d512f85ef979480cfd28c80077222549d84727a9
font_01_sfnt_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 11036 bytes
SHA-256: e2b509a0c50e1a2a461e26e665db403ae3329aed1118dc96fbc94b752221e165

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