Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f4ca01800292ed…

MALICIOUS

PDF

72.6 KB Created: 2021-03-28 17:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c012ed31786287a856067f3c710b3a87 SHA-1: 65039d674398deaa0ac99f54be25478702b0a98b SHA-256: 44f4ca01800292ed861a7867219e040a43a7fbc11d97d6376f15bc4e43fdc1c7
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable hosting, suggesting it functions as a link farm for SEO manipulation or to distribute further malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://resalured.ru/wix?keyword=blank+dog+shirts+canada PDF link annotation
    • https://zogelamugem.weebly.com/uploads/1/3/0/7/130775951/03eb0.pdfIn PDF document text
    • https://risogaruwakev.weebly.com/uploads/1/3/4/6/134634919/9162717.pdfIn PDF document text
    • http://azakalaza5.xyz/kaxaxivonizopedubireve17jf8.pdfIn PDF document text
    • http://dom-bita.org/averaging_model_reductionmp991.pdfIn PDF document text
    • http://tinubovibiwiwi.iblogger.org/air_force_1_white_and_black_sole.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/ladojenefe/7935171828.pdfIn PDF document text
    • http://gibexuge.rf.gd/pocket_anesthesia_free.pdfIn PDF document text
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_61e11fa5b4eb4f3cae53413bfcb9d37c.pdf?index=trueIn PDF document text
    • http://memajale.epizy.com/what_is_initial_vertical_velocity.pdfIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_8644f814a56644ab8f505d0b15b1cf8f.pdf?index=trueIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_122521620926490d8ef526d9b21974f6.pdf?index=trueIn PDF document text
    • https://e6a48395-9ebc-465e-8505-c4b20d7b8e72.filesusr.com/ugd/81e12b_bb61e371f0d944b3aef930b6ad63349b.pdf?index=trueIn PDF document text
    • http://vegozamefokim.rf.gd/understanding_nutrition_3rd_edition_free_download.pdfIn PDF document text
    • https://e714dd98-3e42-4604-aba1-6d4b2506b1a8.filesusr.com/ugd/742965_8eadb7817c7c42fdbec14af4e4d9a929.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/saxefi/latex_template_article_arxiv.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/skinnytaste_balsamic_chicken_sheet_pan.pdfIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_dbabf784311c4bdbb90451a11a8852a1.pdf?index=trueIn PDF document text
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_987d23c27e5644ca9a3269e3f8708b64.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/muguromeriwarevidil.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_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 5312 bytes
SHA-256: 51557e095fc3e263e04cb32dfe7755d18d3f45b0e1cad2f8872f7ec4562b0b88
font_01_sfnt_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 11304 bytes
SHA-256: 0ec515180b5938f027c4d9292c6e9536555b525c1e2a7d1b743427bf7a8d8fc1

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