Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5b7316eeb66b2f…

MALICIOUS

PDF

66.7 KB Created: 2021-03-10 12:29:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 3c4eda4458269fbe20954792fbce8ef5 SHA-1: 5b4fb1ef2eaef910962745c5cbccbd6595cb3ccd SHA-256: 2b5b7316eeb66b2f9b9a570c9f84c3c50c744cac089d12794fc85e26d0508227
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wix?keyword=kook+e+king+manual PDF link annotation
    • http://lulelege.iblogger.org/oregon_blm_map.pdfIn PDF document text
    • http://pusokum.66ghz.com/45748509384.pdfIn PDF document text
    • https://cdn.sqhk.co/xipapotug/jwfjgcZ/94725972808.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/dhiGghV/how_to_call_pakistan_from_usa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_43a8d792d6594ed2a5ad095ecf6c12e6.pdf?index=trueIn PDF document text
    • http://bawatusarab.epizy.com/pejumakuwifova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91333d6d-4bd6-41be-9871-6cd65048dbb2/34111769991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22ba66c0-ec71-46eb-837a-ddeefaf546c5/how_to_record_installment_sale_in_accounting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a1ced20-5cfd-4e03-9f7b-4dcd11c5bae1/43333634853.pdfIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_6d362e46d1d04fcfa536c44082f8009a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f15c5d-1d2a-4920-9253-9674b02dcd9e/81048657427.pdfIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_a751016a10eb47c18070644acdc1e76c.pdf?index=trueIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_2955001c5a6b4f2ab11ed7d555e4dc65.pdf?index=trueIn PDF document text
    • http://rorujuzolu.epizy.com/61859949553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc06c89b-a607-464f-8cc5-02bc4fd8dd71/wovapo.pdfIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_9bb8dc22853e454795951172827b7857.pdf?index=trueIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_61e218d047464f448d07033d515ddd77.pdf?index=trueIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_906f0ec810f34d27a4126d13e228eb43.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/213f6514-8fd8-4833-ab39-8e320a58547a/jumping_spider_8_eyes.pdfIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_c7483eb37bd249a1bf7a0578ac9cb815.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cf4b3b1-c80e-4fa1-b1fe-0fde1cdf3083/movipafu.pdfIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_815b1adb5a3c4a3f86a6eb40ce6581b3.pdf?index=trueIn 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_off0000ca9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9E 4764 bytes
SHA-256: 64ac45047de5730cd748beab39b0d67e3f2eca1b3236b1fc0d995ad4648b5d12
font_01_sfnt_off0000dac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC8 10300 bytes
SHA-256: 429c93aa5ea037b8e250ef70a35204ab8bd07da603f3f98bf12ff90c123186b8