Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31aedee8c0b77bc…

MALICIOUS

PDF

82.2 KB Created: 2021-04-25 17:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4cdb63ff419e1224ead60c7336b11d5e SHA-1: 514cc65081814ea01a4ee08bdbdbda3601f2555f SHA-256: e31aedee8c0b77bc973f4cf7898cff2d068521cdf0d62041886ade0c3d092f39
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. 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 0.9998

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://maypoin.ru/strik?utm_term=metro+2033+redux+good+ending PDF link annotation
    • http://upsbox.ru/23545525331e56ad.pdfIn PDF document text
    • http://allfreebets.ru/accounting_excel_template_freermhnq.pdfIn PDF document text
    • http://ninavadilu.22web.org/luwumizefazexu.pdfIn PDF document text
    • http://navaram.online/cycloid_drawing_machine_manualguax2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kidoputuf.epizy.com/94066950273.pdfIn PDF document text
    • http://pepebejawu.epizy.com/72095704392.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_820a8e5ccf41468b941cb1bbd64285c0.pdf?index=trueIn PDF document text
    • http://wunipowozat.rf.gd/manualidades_para_halloween_con_botellas_de_vidrio.pdfIn PDF document text
    • http://taxatix.epizy.com/advanced_engineering_mathematics_solutions_zill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c46d8ad9-99af-485c-9530-7606b7278b50/17480374663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2debdc2-3a23-4711-bb8c-72862e79065e/wuvakamolupezowug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e84b0bf2-1a0f-4afc-b86d-829b3d6442ad/jemebogigevigalorifisinek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2949b35f-f8c5-481d-ad35-c70e85b66d86/chicago_manual_of_style_quotes.pdfIn PDF document text
    • https://60b161a2-b511-46bc-b48c-7ca4331f2db3.filesusr.com/ugd/34b71b_3289c5b1dfb4456292b13b01460f4760.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/362761c2-f15f-4908-8bad-62a96304ae7d/5_important_facts_about_the_great_depression.pdfIn PDF document text
    • http://vajitefafuxuz.epizy.com/tiwubi.pdfIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_42f397b96faf464abae8c6105ec64903.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf2d4fd-64d6-423a-b6c3-7f4a8facfebc/misotoxadimuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc313ae7-47d4-4f9f-af9a-4e9e30f8656c/71415225998.pdfIn PDF document text
    • http://pevivudawof.epizy.com/pubg_mobile_uc_generator.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_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 5084 bytes
SHA-256: 8b39064abef17ff2e274771c0682c5723e8dbc5b12c085650e64aced13fa9dde
font_01_sfnt_off00011485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11485 11168 bytes
SHA-256: aa41617742dd1c9c4532119fc82c6bdeed1d9b2356ed209caef93f12568351fa

Open this report in the interactive analyzer, or submit your own file for analysis.