Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d12e897d8ddcec…

MALICIOUS

PDF

87.8 KB Created: 2021-04-12 00:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ab2acc4d5a8a801d0923f08ddfd42bea SHA-1: aac589aec63db3fd2a2317f59bee4892067f3ccb SHA-256: c8d12e897d8ddcec7b8f371029cf8fd91e44acc683fccd6d5884d3d8951a9d43
106 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://resalured.ru/strik?utm_term=manual+de+usuario+iphone+6+plus+pdf PDF link annotation
    • http://mibotirekusiw.mywebcommunity.org/74688327045.pdfIn PDF document text
    • https://cdn.sqhk.co/morureju/jicrjVS/tunevolezokezajawegugo.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/bovumokirif.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/ChJqhfz/maxeruzigijuk.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/l6qQidC/zavigazojixuzupotibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481397/normal_6064b0ac4f592.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/hbKQlhg/68879995522.pdfIn PDF document text
    • https://cdn.sqhk.co/papazokixe/gg72QdU/wozogi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487658/normal_5ffa3284a461d.pdfIn PDF document text
    • http://bugiwuxad.medianewsonline.com/lovimupumibot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410416/normal_603a0a55e565d.pdfIn PDF document text
    • http://pogibofabut.getenjoyment.net/36006771800.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371800/normal_5ffb963dc0eee.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://s3.amazonaws.com/zizene/waralirinutadalew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bd739ba-e138-45e1-ba8a-cff8bd39e4f9/linux_beginners_guide.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_0202c3d9fc064c6499d33efa3b160d44.pdf?index=trueIn PDF document text
    • https://a1bd7baf-2de3-4c81-8914-4b74a732ecf9.filesusr.com/ugd/c89f15_b869daad425145998ba8d650e2e11af6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/cambridge_young_learners_english_starters_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9c0c126-f5f2-4ba8-9ea7-f51c93e66fed/what_are_the_rules_for_spades_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/nolapudubuzebex.pdfIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_0db73187747348aa8341dbb014d6ca3a.pdf?index=trueIn PDF document text
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_a40502fe49264e72b2d9dcbfce798f38.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a3592da-da3b-4665-89bc-5347f9bacfee/how_to_become_a_dental_coder.pdfIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_783ce7f004354878af0c4a437e31e523.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc13b972-b815-42ea-bc53-ea1d6cfcc3d2/bubirerizemuxixomukakowiw.pdfIn PDF document text
    • http://xiwexuxe.atwebpages.com/punjab_national_bank_education_loan_application_form.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_off00010c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0B 5088 bytes
SHA-256: 2d8a5ad7f8c157055d779ccde4f2034184c9d5f4814bd8721a924e2897745e16
font_01_sfnt_off00011d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D46 11748 bytes
SHA-256: d9d202b5177b1ada6c91a44b9a8b0efce21e5af1bfa666dbf453ef857969d389
font_02_sfnt_off00014395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14395 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378