Malicious PDF — malware analysis report

Static analysis result for SHA-256 266d6029c052667e…

MALICIOUS

PDF

97.6 KB Created: 2021-05-22 12:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 018af7201bc98557247bf7de159be8e4 SHA-1: cc27cf936bb7a31a27eb2e49597f6252fc45779d SHA-256: 266d6029c052667e277ad23c58b45ad364d37551e5faa4c6b1d74ec9f72ae1c4
186 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware or facilitate phishing. Although no scripts were directly extracted, the PDF structure and link farm heuristic point towards an attack pattern involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://monuwapomobi.weebly.com/uploads/1/3/4/7/134730240/9446214.pdf In PDF document text
    • https://kibajalixil.weebly.com/uploads/1/3/0/7/130739780/sibugikifubadabima.pdfIn PDF document text
    • https://lenukanaferu.weebly.com/uploads/1/3/0/8/130873899/poxorud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451929/normal_5fdeef112c6ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466996/normal_5feef326496ab.pdfIn PDF document text
    • https://subolamamojoga.weebly.com/uploads/1/3/4/7/134719430/jomotoxegipijuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477137/normal_6050d84c09c90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444358/normal_606106866c75f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_60419cde4488c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405193/normal_6061ed1a4249a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_604b9ac81de75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452626/normal_60292f44742d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/3IgsHNHpEfs/wb?keyword=neat%20scanner%20nm%201000%20manualPDF link annotation
    • https://s3.amazonaws.com/jadere/90311078684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1696e6c0-38ae-44b1-9f13-9d92da6f6494/gem_trails_of_southern_california_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f3c86a-7b06-4ee9-a645-1ae9d851d4f1/how_to_find_cross_sectional_area_of_a_cube.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/enfermedades_alimentarias.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/what_are_the_four_attachment_styles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1088dc-7d1a-4c28-b08e-b143538d8927/samsung_8000_series_refresh_rate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/546c8580-fc69-40d4-b042-dec7f3ea3e15/lg_47ln5400_hard_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d56a629-1a61-401c-8958-e70bedf3babf/pipe_fitting_formulas_app.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/predator_generator_8750_battery_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/the_face_shop_calendula_mask_sheet_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/816f4270-6aba-4312-af6a-0c836d55edc7/4_pics_1_word_answers_3_letters_sheep_car_crash.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13117 4832 bytes
SHA-256: e28b4d7606752e58f7859dfe57d5918255694a4cd437fe58106020d321e139ed
font_01_sfnt_off00014162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14162 12148 bytes
SHA-256: bfcdd35f0816dbcbf152d69732e08891882ecb0f91510e80d1f3c6534802608c
font_02_sfnt_off00016abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ABD 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3