Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f464357f17613c…

MALICIOUS

PDF

79.0 KB Created: 2021-03-15 06:18:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d58f05263fc501091e07e03dbd0496ca SHA-1: 7f62559f550db103ab09368cbb6c9eb39aa61af4 SHA-256: 77f464357f17613c7ea66b59b8dcfd132aeacdfd57f3be4ca698f4cf34dc17da
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the embedded URLs and the nature of the link farm suggest an attempt to exploit users via external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://maypoin.ru/wix?keyword=armco+metal+buildings PDF link annotation
    • https://xuzipitazejaj.weebly.com/uploads/1/3/4/7/134722028/175f3fd1d6c.pdfIn PDF document text
    • http://netekigupi.22web.org/full_hd_wallpapers_1080p_for_laptop.pdfIn PDF document text
    • http://pusedoropeseb.66ghz.com/aicc_full_form_in_engineering.pdfIn PDF document text
    • https://vapatukubarokul.weebly.com/uploads/1/3/0/7/130739856/sevosoxaw-xokonugu-jekuxez.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
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_6e246df71e6f42909ce97532f6899cb0.pdf?index=trueIn PDF document text
    • http://fulawumobolofog.epizy.com/fadejusesi.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/64551487328.pdfIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_a7a196dbeac44ca8a020a7acd1614da8.pdf?index=trueIn PDF document text
    • http://bejopirobi.epizy.com/what_is_the_salary_of_a_medical_researcher.pdfIn PDF document text
    • http://gidigeja.rf.gd/local_anesthesia_dental_hygiene_study_guide.pdfIn PDF document text
    • http://sorofakomefus.epizy.com/spoken_english_course_free_download.pdfIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_cff10f344da944f5ab96c41c880b43b7.pdf?index=trueIn PDF document text
    • http://wiwifiladovov.epizy.com/pojesilimawif.pdfIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_c51f19efa9d945889ae5a51c42337f82.pdf?index=trueIn PDF document text
    • http://jigugepolega.epizy.com/interior_design_programs_dallas_tx.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/what_was_alexander_the_great_accomplishments.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_off0000e790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 5272 bytes
SHA-256: 1a785c8ed7af341d36c3c6473e176d5e813bf57a46930a5707f2af83f7ccfceb
font_01_sfnt_off0000f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 11916 bytes
SHA-256: c6f0cba72a1d20b6c60fa983ed4ca9a5ce88ee23e2536c91a7ae3d6b06c45012
font_02_sfnt_off0001211d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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