Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe847ecc4ccb9d2…

MALICIOUS

PDF

72.5 KB Created: 2021-02-28 07:26:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bccd31b4a34138a54a4ed7dc485316b2 SHA-1: 41ead3e8a9a959b1784c9bd3acaba92d50e5f35d SHA-256: 1fe847ecc4ccb9d24442bf38c62d391c4dd939b56096299c0e898a8c672a9833
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious content.

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://jacksth.ru/wb?keyword=warehouse%20fire%20safety%20checklist PDF link annotation
    • http://smartcreditcheck.info/is_comptia_a_necessaryk9vah.pdfIn PDF document text
    • https://kisumeselebo.weebly.com/uploads/1/3/6/0/136021012/lifirewetewul_senatoximux.pdfIn PDF document text
    • http://br1.red/49527587820rcccv.pdfIn PDF document text
    • http://ukrinsure.com/ceconite_repair_manual739vk.pdfIn PDF document text
    • http://cabinetsop.xyz/how_long_to_train_for_a_half_marathon_beginner8sck9.pdfIn PDF document text
    • https://gawosiluzetur.weebly.com/uploads/1/3/4/6/134631715/6130549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_5fe86d5e23237.pdfIn PDF document text
    • http://nakrutkavk.site/good_spin_questionspzsqc.pdfIn PDF document text
    • http://igafnd.org/frigidaire_refrigerator_repair_personorlci.pdfIn PDF document text
    • https://kigodebilak.weebly.com/uploads/1/3/5/2/135297846/sorisakovo.pdfIn PDF document text
    • http://evatopshop.xyz/xajevukowijukonufofokunakxs5b.pdfIn PDF document text
    • https://betoxugibujimiv.weebly.com/uploads/1/3/1/0/131071043/modok.pdfIn PDF document text
    • http://rmk4sale.xyz/3052089747391snp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465025/normal_5ffd4d7e3111c.pdfIn PDF document text
    • http://lusolakidareve.mywebcommunity.org/turbo_mailer_license_key.pdfIn PDF document text
    • http://useporte.xyz/porque_una_mujer_no_sangra_cuando_tiene_relacioneskw4jt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380682/normal_603b121cba6e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ripapekum.epizy.com/43142719301.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_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 5148 bytes
SHA-256: 9c82380e2b12d7c05970e72c4c7e39800d8c492185d014a148dc5d885b647dec
font_01_sfnt_off0000f1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 10276 bytes
SHA-256: 17329b62d9b49d8bcd6882502b90bcfc06a7bfa847f71fe8c08a8e37e561d721

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