Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b618b54e7be2fd1…

MALICIOUS

PDF

68.8 KB Created: 2021-02-19 00:01:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: da154aa24cd512c1f3e60a9a334347a4 SHA-1: 5f1a422be55bbe1fc402e9e3a1aa930527f04f06 SHA-256: 4b618b54e7be2fd1c18181ff13d7711a29fddb948d1b8eebf4904d2d9ae6e4a7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO abuse tactic to distribute malicious content. The primary external URI, https://maypoin.ru/wb?keyword=star%20wars%20encyclopedia%20of%20starfighters%20and%20other%20vehicles%20pdf%20free, is presented as a search result, likely to trick users into downloading further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/wb?keyword=star%20wars%20encyclopedia%20of%20starfighters%20and%20other%20vehicles%20pdf%20free PDF link annotation
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/b1d8c88187ab6.pdfIn PDF document text
    • https://sorudexene.weebly.com/uploads/1/3/1/3/131384015/fisuvufuvi_borakodatunekox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366341/normal_5feb6cd7aa2d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454673/normal_60204aedcbd9b.pdfIn PDF document text
    • http://jufidozotazi.66ghz.com/wodapawokafumolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403264/normal_601e618e97542.pdfIn PDF document text
    • http://kawofeme.iblogger.org/electrical_engineering_degree_online_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dijawazuk.rf.gd/mobiridetoduzesuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/74056519352.pdfIn PDF document text
    • http://putiremupupunis.epizy.com/nitubezan.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/blank_sheet_music_paper_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/prevent_form_submit_with_jquery_validation_engine.pdfIn PDF document text
    • http://biwovake.rf.gd/furoxotixajedigawakimug.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/97095885456.pdfIn PDF document text
    • http://kavisawadafo.epizy.com/how_to_access_icloud_on_android_phone.pdfIn PDF document text
    • http://xosumuzav.epizy.com/hangout_dialer_app_for_android.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_off0000cca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA2 5772 bytes
SHA-256: 3bfb2ec48f58b81693c69132222a1e4cbc4009b02d898f1eaa4c062694fbc48a
font_01_sfnt_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 10900 bytes
SHA-256: e6ee47a1c5bf0946fa40e94c561e7c80e6af7af94faef75829c646cd16323663

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