Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b0f0a113c8f90d…

MALICIOUS

PDF

78.6 KB Created: 2021-03-14 11:02:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b2a1332c4ef5cc50dc417b51a865c1f0 SHA-1: d596f508d31d6b4dc1dc59a855c77a0d0e6347af SHA-256: a4b0f0a113c8f90d7631dd1266b4c716749b9dfd35581c00da4ecf869abdc1f5
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 pointing to disposable hosting, suggesting a link farm or SEO spam tactic. The primary external URI, 'https://golowaki.ru/wix?keyword=marriage+based+adjustment+of+status+checklist', is likely part of this scheme to drive traffic. The ML classifier strongly indicated maliciousness, and the overall structure points towards a malicious document designed to redirect users.

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://golowaki.ru/wix?keyword=marriage+based+adjustment+of+status+checklist PDF link annotation
    • https://gujavaluzosozu.weebly.com/uploads/1/3/4/0/134013303/8864678.pdfIn PDF document text
    • https://tebijiburowuwe.weebly.com/uploads/1/3/4/8/134850880/sogazetike_jenagaxixi_jijewopufita_luvipifu.pdfIn PDF document text
    • https://vazaratel.weebly.com/uploads/1/3/4/0/134017227/kokasamezisijewowidu.pdfIn PDF document text
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/wupigemafiti.pdfIn PDF document text
    • https://lilikegemuvil.weebly.com/uploads/1/3/1/3/131398424/3609987.pdfIn PDF document text
    • https://jejejawoberug.weebly.com/uploads/1/3/4/7/134768650/7668394.pdfIn PDF document text
    • https://patoduwewoz.weebly.com/uploads/1/3/1/4/131483118/4b66827c8cb2226.pdfIn PDF document text
    • https://mefifusefom.weebly.com/uploads/1/3/4/2/134266023/vurukitiv_vexujalegumam_rujemexorete_zarisuxonobame.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/44021993116.pdfIn PDF document text
    • http://bulojidaxuxuvod.rf.gd/how_to_take_out_a_viper_alarm_system.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_13dfee7443fd427b80ca10395bb86fe5.pdf?index=trueIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_064ff4e72e01410e8620484d7fa1e7dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/12357390576.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_6f776c2f4eb04a089750d4adcb696521.pdf?index=trueIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_399a88136d854a649ed1b03e4efc471c.pdf?index=trueIn PDF document text
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_828943007e624cd9a8948abe6472d5cb.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_4fca7a6a82584ba2beea397f275681c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nasitevu/tuseniwofinu.pdfIn PDF document text
    • http://leruvuk.epizy.com/starcraft_hybrid_travel_trailers_for_sale.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_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 5720 bytes
SHA-256: 41c2dad6eb089c07c6a255096004fbf0b5d2fc03edf84587e163e3588e03dd88
font_01_sfnt_off000104a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A8 11312 bytes
SHA-256: 235eff64e86620266e96d4c42faedce9570715d356d525310cbd53ed93fdb85e

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