Malicious PDF — malware analysis report

Static analysis result for SHA-256 148be7e7dd4b46cd…

MALICIOUS

PDF

85.8 KB Created: 2021-03-31 14:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e94681e9399e812fe18a92342a656a22 SHA-1: dfbf0c52ad22ef60d96202835fd59eb0e18e120c SHA-256: 148be7e7dd4b46cd7109a66b062be12e70eac10f881efc26be5ff6826eb11a2c
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to linguistics, suggesting a lure to disguise the malicious intent. The presence of multiple external URIs, including one on 'baarspo.ru', further supports the hypothesis that this PDF is designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/award?keyword=characteristics+of+human+language+in+linguistics+pdf PDF link annotation
    • http://kushtanash.ru/xukomenijemepirunije4iali.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/whats_a_logic_model.pdfIn PDF document text
    • http://biniwitovo.mywebcommunity.org/how_to_open_file_without_download_in_php.pdfIn PDF document text
    • http://podcard2020.site/218334460954l39f.pdfIn PDF document text
    • http://wowurilagufa.iblogger.org/bamezifiwametiw.pdfIn PDF document text
    • http://kmikaerfs.ru/kesula1zh4t.pdfIn PDF document text
    • http://tiktoktop.design/vurekuwogur4s73.pdfIn PDF document text
    • http://sell-toclick.online/18886736826dc10y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5b0ea1c3-b874-41d5-a3cc-49595beb80a6.filesusr.com/ugd/0c63be_8bdc7f7b4a814e4699c0e4be96a02058.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasawe/jipofadotuxivore.pdfIn PDF document text
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_a35f71dd1f1247a68fee683da5062df5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71461e73-fe13-43f7-85bb-100ad9f17d47/nexub.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/how_to_tell_if_eotech_512_is_real.pdfIn PDF document text
    • http://wojibikifi.myartsonline.com/3789252893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c77f379b-370a-466c-b105-b47a85f37e19/95312643308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b19b5a50-6bf5-4fab-aebc-675a324d9a43/did_attack_on_titan_manga_ended.pdfIn PDF document text
    • http://likebisuwuselo.rf.gd/tavifurekabaperasov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afb42d13-194f-4746-bbca-d7002c82fa2d/36278843468.pdfIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_007a64e63a454920bf44348e5cbf9cff.pdf?index=trueIn PDF document text
    • https://619c993e-e215-4b07-891b-88776ecab8c8.filesusr.com/ugd/1fce43_e9b61ec2c384466aba2373daaac7fe9c.pdf?index=trueIn PDF document text
    • http://zuvelekoj.epizy.com/atomic_structure_ions_worksheet_3_answers.pdfIn PDF document text
    • http://wesukaxibofawu.epizy.com/pearson_biology_source_11_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/android_bottom_sheet_behavior.pdfIn PDF document text
    • https://713ff9a1-ee4a-4317-942a-697bf1b0458e.filesusr.com/ugd/e2f197_96c084ae58f94084812501ef97c5849e.pdf?index=trueIn 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_off000112b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B4 5476 bytes
SHA-256: 2e19a51692095f631ad42cdfe8b2b21fb57df1c1e92a63fc8cc672d5001b96d2
font_01_sfnt_off00012520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12520 10808 bytes
SHA-256: 0e562ead86b04ef49073efe0959a436aa48824bc54f1e5da1fb1b26c4be1ce1b