Malicious PDF — malware analysis report

Static analysis result for SHA-256 321b2ac2283fb622…

MALICIOUS

PDF

80.8 KB Created: 2021-03-19 05:17:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1df75fd68935152f693da592f42a4d8c SHA-1: 1107149e0a02cad07191b933d6cd0741b4a5c14c SHA-256: 321b2ac2283fb622ec121e718c7978deae36df88a52bf62da161c4cb180f2d92
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one heuristic specifically flagging it as a 'PDF_SEO_LINK_FARM'. The embedded URLs suggest an attempt to direct users to potentially malicious content, possibly for phishing or to download further payloads. No scripts were extracted, but the overall structure and URL distribution point towards a malicious document.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=ff14+suzaku+extreme+guide
    • http://sidesevofexow.22web.org/answers_in_genesis_vbs_promo_code.pdf
    • http://jofarofuwudeveb.66ghz.com/standard_galactic_alphabet_font.pdf
    • https://cdn-cms.f-static.net/uploads/4464730/normal_5fe7e828bedaf.pdf
    • https://cdn-cms.f-static.net/uploads/4470231/normal_6021a03812adf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nuxajirurus.epizy.com/fevovovaviferelaxawesufar.pdf
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_867a7cf5d55a4abc8568da83bd1467ea.pdf?index=true
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_d9271b78a3bf47d9ad066ac02578d892.pdf?index=true
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_445d7f777a684d52a06bc38c58e323bd.pdf?index=true
    • https://s3.amazonaws.com/muwemivumazulax/rimix.pdf
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_0717b2d94ac84550aebc6c1ed346601b.pdf?index=true
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_22fbf9f60f544430bb96551be69b8ff2.pdf?index=true
    • https://s3.amazonaws.com/tafogusegabomu/kunudutufapipupedipipulu.pdf
    • http://xiramegakasivi.epizy.com/67086709014.pdf
    • https://143c7e3e-1a56-4739-9c24-5aac26b0263b.filesusr.com/ugd/28d7c1_b431199b6ecb45928082fc3eb319a162.pdf?index=true
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_508a99ae37c74876ad8ea4487af552d8.pdf?index=true
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_e2997eedf3774869b8f5b343dea1a859.pdf?index=true
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_78298b8558d0445290e287fb6fd46e0b.pdf?index=true
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_6086bc33db994aee8841f08428d2a9d3.pdf?index=true
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_5b844c4f623349738cdb75c35a79f257.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc03.bin
d84c1346345bc9305c0340bef1bb757e04153623f3cb5b0533989723cdd604eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC03 5472 bytes
font_01_sfnt_off00010eaf.bin
1a2beaad71f2729f5dfd0ddc73f9c39a0fc6a6335c516381f08f8fa94b28ab73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAF 11724 bytes

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