Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d5ab8cfff40ac4…

MALICIOUS

PDF

83.2 KB Created: 2021-03-24 16:30:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 26de794f942e42dc8829adcfd5f42347 SHA-1: f6a2c7592950b65e83ea16107dff18a52838d2ed SHA-256: 97d5ab8cfff40ac429d64cbfbdad6b024a3662b4c37de0de3001b8b18e32cd74
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The 'special education teacher aide job description' in the document body is likely a lure to attract clicks. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, potentially leading to further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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://dugedepap.ru/strik?utm_term=special+education+teacher+aide+job+description PDF link annotation
    • https://wiguvufa.weebly.com/uploads/1/3/0/7/130775639/7440b2.pdfIn PDF document text
    • http://piter.store/music_video_storyboard_templatekhxz8.pdfIn PDF document text
    • https://rasazumeg.weebly.com/uploads/1/3/1/4/131454762/tonum.pdfIn PDF document text
    • http://medtechnika1.ru/polilanadomsexn.pdfIn PDF document text
    • http://maslovauto.ru/antes_de_partir_filme_completo_dubla2rr8d.pdfIn PDF document text
    • http://pavaverijakat.iblogger.org/goodman_gmp075-4_specs.pdfIn PDF document text
    • https://rofujerejikuf.weebly.com/uploads/1/3/5/3/135388349/db0cae847.pdfIn PDF document text
    • http://expo-kit.ru/zotijumowunb7rbx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_ef56611a39c341eb93bfe2527b3828d0.pdf?index=trueIn PDF document text
    • http://tozudojixoku.epizy.com/ambedkar_university_lucknow_admission_form_2018.pdfIn PDF document text
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_0eb140e3590f4804882fc4d926d31bf8.pdf?index=trueIn PDF document text
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_ade0010f30c942f48fb55237fb2a2c3f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bee4e5a8-d6d4-4f80-9cf8-994934ab30e8/the_tempest_full_summary.pdfIn PDF document text
    • http://gazisemodab.epizy.com/bhojpuri_superhit_comedy_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b929bcd4-0813-4b40-bc6d-2825153c021c/86643811387.pdfIn PDF document text
    • http://gonaviniji.epizy.com/ledol.pdfIn PDF document text
    • http://kitomov.epizy.com/singapore_math_homeschool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10b0fb1a-046c-4b49-9148-19e6e1d3ea4c/puwube.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_b4508913688945d984205421eb978bc7.pdf?index=trueIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_c51d351c99314dbc8566494360134f70.pdf?index=trueIn PDF document text
    • http://javulivaxetotes.rf.gd/lukewur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8484e547-f663-44da-b26d-c9f3d38f62af/85251432636.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001235f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1235F 18048 bytes
SHA-256: eb0392cd64b5103e0964d5469e1178bbf4215d1d113e320ae5df11b3394ea86a
font_00_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 5480 bytes
SHA-256: 5463c314962098caa134cff3e1f136877053c50169f2dc82ff4e99ab3fb061dc
font_01_sfnt_off0000feb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB6 10704 bytes
SHA-256: 3997aa2e779ab2f7b6c172d278852a28c32cca95f0cc524602e8de445a826a7f