Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11ca3c2c9e2212c…

MALICIOUS

PDF

74.9 KB Created: 2021-04-04 19:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a7da37961f1983aa69f171b03de1d035 SHA-1: 1693d7dab5ea5e11b464d963df8b5eff97454fc2 SHA-256: e11ca3c2c9e2212cb41c95472ab9c2ef597dd6d5fea992f60f7f2606350ab33f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs suggests it is designed to redirect users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/award?keyword=electrical+engineering+subjects+pdf PDF link annotation
    • https://miwolugakibu.weebly.com/uploads/1/3/1/3/131383652/521004da.pdfIn PDF document text
    • https://ranumurubakek.weebly.com/uploads/1/3/5/3/135341533/295bc77a0.pdfIn PDF document text
    • https://kuzimedunadaweg.weebly.com/uploads/1/3/5/9/135993385/4970667.pdfIn PDF document text
    • https://wemosixalaku.weebly.com/uploads/1/3/4/3/134315089/318283.pdfIn PDF document text
    • http://kexipisibufexur.22web.org/prevalencia_de_cesarea_en_mexico.pdfIn PDF document text
    • http://zenurosaxaniz.22web.org/rireluna.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://logasizujonasi.rf.gd/69428616266.pdfIn PDF document text
    • http://jokadezi.rf.gd/27038214843.pdfIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_96d4d5b99f6a497ea3f1f9acd97c3a30.pdf?index=trueIn PDF document text
    • http://fogabifotu.rf.gd/moruxaxisusodigodadomuwam.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/80907370269.pdfIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_4f7b34b1184c4a109258b04c233d39d7.pdf?index=trueIn PDF document text
    • https://f516a5e5-1936-4b34-b436-a929b3a34b8d.filesusr.com/ugd/774001_2e6c1e5093324bd98b63326393b65974.pdf?index=trueIn PDF document text
    • http://sinidofapij.rf.gd/download_al_quran_dan_artinya.pdfIn PDF document text
    • http://jilevatawew.epizy.com/86635437760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0fcbd79-9832-4bfd-9511-13ef1c9758e5/how_much_is_michael_buble_net_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d669c499-ef7c-4563-854b-60585fd797b0/jazzy_select_elite_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46bf3d43-25f1-4ebb-b8e7-08298cb894c0/medicinal_chemistry_jobs_salary.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/40981670239.pdfIn PDF document text
    • https://82a15d5c-09b3-4b2c-b6d5-cdf01964cb25.filesusr.com/ugd/5adcb9_4f150f87aabf4d18a957428f84cf03dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vovuzize/56142839730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab84396f-4a2a-4b47-9e7d-266d73b32bbb/xixaxetopedanaxoleduvono.pdfIn PDF document text
    • http://tabifewegijip.epizy.com/bengal_tiger_telugu_movie.pdfIn PDF document text
    • http://siwibaxi.epizy.com/peviditejuxifopusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99d9cf9-b752-429e-98af-718f0999c3da/nodasejobanufatezoxigo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CD 5496 bytes
SHA-256: 90543749ff28f77f36f0c8651d7004dbcdf5897af5da530c32a65835e51b1c27
font_01_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 10944 bytes
SHA-256: 3dfcb3aff0cbc3d8d060c36cc4fde0e7d1f5e8e7d77f344cbe99ec3f4fabffbc