Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7ebac2b00045fe…

MALICIOUS

PDF

75.7 KB Created: 2021-03-19 00:02:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fc07fbb97a663444db0ecb2c7224e2e5 SHA-1: aefbf4b6a7446efe2ade516472a7105b05cca1af SHA-256: cd7ebac2b00045fe68cdded26d452f5f4b598ee8ac08e818b0c970ffb02b22e4
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious or spam content.

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://zajinet.ru/wix?keyword=verbo+ser+worksheet+pdf PDF link annotation
    • http://hurleyshamburgers.com/mf_135_serial_number_platez4u40.pdfIn PDF document text
    • http://leon-stavki.info/how_to_pair_my_disney_circlemom3y.pdfIn PDF document text
    • http://flowerport.market/berewitijilorakuvanenejuvwkw8n.pdfIn PDF document text
    • http://propovar.ru/wenudosowem5t94.pdfIn PDF document text
    • http://healthytrands.com/577083193838dkf5.pdfIn PDF document text
    • http://momentshop.space/h_and_r_block_tax_course2b0y9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zenejifawulo.epizy.com/ganegaliputexubiranafub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ffa9e37-2953-42b7-9a4e-6f7d153a9ab6/weber_grill_restaurant__academy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0caf3579-ca86-409b-9f04-dbae1cb5e2be/mojudededeme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcf1eb95-fe54-481e-9e4c-f6f428438d24/is_logitech_k400_bluetooth.pdfIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_97c44149524447aa938df1c8532368f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8885269-f4d5-497f-ac0c-e55113e9f0f4/how_to_make_origami_birds_out_of_paper.pdfIn PDF document text
    • http://mafilijesov.epizy.com/ruzumivire.pdfIn PDF document text
    • http://jojajixinoxu.epizy.com/string._format_vs_stringbuilder_performance_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/861d563a-a040-42aa-9cc0-cbf7f1024921/12_steps_of_na.pdfIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_cc2c6d08bad7411fbb1fa687e21a4b7f.pdf?index=trueIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_072f73ddc60547b789d8a7d593ecff1b.pdf?index=trueIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_64ec13f4d0e64c3796e70743ed949691.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_off0000e6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 5148 bytes
SHA-256: fc814db7c6ae7a9d909c3b1fd409affcb408126355c24fc0ecae26d693f972e5
font_01_sfnt_off0000f885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 12628 bytes
SHA-256: b9d3a8cc1681a5787e4bdd3c3a0e59b3c0c23821d4671f5176dbb708d845a0c7

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