Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4355177c6acda2…

MALICIOUS

PDF

73.2 KB Created: 2021-03-25 03:12:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 03b06843317ad05563fb79e6fb959812 SHA-1: 5a2e2235f92a56ff4a28554521c15899f04e256a SHA-256: 4e4355177c6acda2cd7cb69d5cc4945faac447a0775d94f26a3edf87e5a9ef4e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://vilenefex.ru/wix?keyword=java+swing+calculator PDF link annotation
    • https://sefokuto.weebly.com/uploads/1/3/0/7/130738721/durifuzawunipoxuzeg.pdfIn PDF document text
    • http://stickerrus.ru/mankiw_economics_notes62iz2.pdfIn PDF document text
    • https://nefagowilad.weebly.com/uploads/1/3/4/7/134742945/9946712.pdfIn PDF document text
    • http://7lessons.fun/what_jobs_are_in_the_royal_navym6kvl.pdfIn PDF document text
    • http://fionainthefield.org/bemikonapaviduwuvecg156.pdfIn PDF document text
    • https://mixozanuzobese.weebly.com/uploads/1/3/5/4/135400893/30b249e13579215.pdfIn PDF document text
    • https://fabedajigunud.weebly.com/uploads/1/3/4/4/134480588/26dbbde4.pdfIn PDF document text
    • http://techanomic.com/1423059258wxepx.pdfIn PDF document text
    • https://ribebolavat.weebly.com/uploads/1/3/1/3/131398139/wanepepu.pdfIn PDF document text
    • http://fb-ig-violation.com/an_introduction_to_language_9th_editionk2z4j.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/pozokimepe/14900031530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/847ff8a2-9c76-416a-9823-cc3b8c30c765/your_grace_is_enough_guitar_chords_key_of_g.pdfIn PDF document text
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_09a22c1317584d0993ffc0131e500e8e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d466dd-df08-4511-b429-2c5e9d76c217/jibudibe.pdfIn PDF document text
    • https://404c0e03-56c4-4888-bb84-d9d32a71a3e4.filesusr.com/ugd/100e2e_70b3b809700e4504b366a46b3d630b95.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/monixapaf.pdfIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_614be22c7bb248b1925c7dd203e0bfd6.pdf?index=trueIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_ee5441ad477a467bb1be89f2db93d627.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/89986003241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdbd232d-cdfb-4180-8e2d-32b52148fd6b/vizisazagisisut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf4e0e1-5ab3-48c7-864b-080d178d8c37/xunovuzuruwikopole.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/95945233282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1223fe1a-61dc-4d20-9fb9-a2ccabd33d5c/43237543937.pdfIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_36d7bb12f0164542a83e6346b858bb02.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_off0000e4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C5 5108 bytes
SHA-256: 93da2c21b21cc1be7bf4434fddc76d7ad532aa1f634e5d386b3419b8b53cc7d7
font_01_sfnt_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 9872 bytes
SHA-256: 20f3f3e276113a2d62889533c0e27393ffa3cdcf4c74b658c86f1dc4cae9c990