Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ee310168745692…

MALICIOUS

PDF

115.6 KB Created: 2021-01-18 22:16:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6768242e6aaaf56cbc60a2334cb9b672 SHA-1: 1144331c32b712525cf10bcdb097288a892f08be SHA-256: 55ee310168745692d236732a6481b0cc3ccc893d838a2c87459c14bcbbb34084
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with multiple external URIs pointing to potentially malicious or phishing sites. The presence of urgency language further supports a phishing or social engineering attack pattern.

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://seumenha.ru/123?utm_term=s10+v8+conversion+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/woteruzid/VsJzijH/vuweref.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxokakijefe/NidjiP7/redogulunidosugebed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446636/normal_5f9db2c407893.pdfIn PDF document text
    • https://cdn.sqhk.co/lakisitu/Qq5ojca/headmasters_barber_shop_county_galway.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/bShiSMI/twitter_careers_entry_level.pdfIn PDF document text
    • https://vuxulirupam.weebly.com/uploads/1/3/5/3/135346280/netoxepoxipo_nikinukej_tapifatetap_waxemegibakad.pdfIn PDF document text
    • https://gemegomuzek.weebly.com/uploads/1/3/4/3/134339500/fusomuroluwuju_rozumu.pdfIn PDF document text
    • https://voziguwotameba.weebly.com/uploads/1/3/4/3/134345279/visokumevu.pdfIn PDF document text
    • https://zinivopupo.weebly.com/uploads/1/3/4/3/134386920/8b5846e8a04e9ef.pdfIn PDF document text
    • https://jumifusat.weebly.com/uploads/1/3/4/6/134629025/b6b70.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/eTYhegR/special_agent_in_charge_homeland_security.pdfIn PDF document text
    • https://banetopebored.weebly.com/uploads/1/3/4/8/134874573/1091943.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/mijedusovineti/steuerklassenwechsel_formular_nrw.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/web_development_course_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/baby_born_surprise_magic_potty_surprise.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_off000182b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182B4 5852 bytes
SHA-256: eead48d5bc8f6b0b5845ae126cbdfb973284dded4b4f0e81df06a2e4cbc0c2e1
font_01_sfnt_off00019697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19697 12196 bytes
SHA-256: 7f2f8b68d54f0a17f3b20943a34383aa11db18a121c2f05ab10f85b00f4f1560