Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fcef8a72d4758c4…

MALICIOUS

PDF

80.3 KB Created: 2021-01-04 21:22:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0f5d40021e4894172e2e453e0b87dade SHA-1: 313038090102a07bdb7a221f81982041604168fa SHA-256: 6fcef8a72d4758c462654cfb00a3c4c2c5eb9d1c0273df805dd3058cdf1399f8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially used as a lure for initial access.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafficel.ru/123?utm_term=skyblock+texture+pack+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477156/normal_5fd274fa85c4f.pdfIn PDF document text
    • https://dotaterezisal.weebly.com/uploads/1/3/4/7/134771172/dokad.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/c8a7f7f4b933ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412160/normal_5fc353cadc1b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475992/normal_5fda1efc7cbca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365634/normal_5fc94f2b93874.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/amPorjf/ravena_azarath_metrion_zinthos_significado.pdfIn PDF document text
    • https://fadevigobawu.weebly.com/uploads/1/3/4/3/134346767/zikizatixawip_remowedimelip.pdfIn PDF document text
    • https://lopuxewununoj.weebly.com/uploads/1/3/4/7/134748711/8571462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489983/normal_5fd1febf6632a.pdfIn PDF document text
    • https://bilemupu.weebly.com/uploads/1/3/4/6/134654663/8663747.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/jhfhfOs/business_calendar_2_pro_apk.pdfIn PDF document text
    • https://vafumesaz.weebly.com/uploads/1/3/4/5/134589630/dononugapedepagegusi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/668ddcd1-5d6e-4c28-90a7-f76e44f08dda/9622524874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/319ad407-6412-4abb-8e9d-14ae0c2f5079/verbos_regulares_e_irregulares_en_ingles_mas_usados.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 5456 bytes
SHA-256: 46ea5b0f22b3e0ecf05aac13d5696f8e6b7a4d9bf2b99702e8dc734724bf738d
font_01_sfnt_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 11900 bytes
SHA-256: c900fa42b6afbc09dac3c062e23c4584a95f11ead681c823ac890efafa5e5d54
font_02_sfnt_off00011ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE0 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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