Malicious PDF — malware analysis report

Static analysis result for SHA-256 431da47adfcb86bc…

MALICIOUS

PDF

90.2 KB Created: 2021-03-20 01:57:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2771926e109d655aa54ee9eaf07ef9a0 SHA-1: 1b2b63db9babbbe53bdca766d76b882186b12bc9 SHA-256: 431da47adfcb86bcc5a67424e7fb6b17bf04f58cd914f74b2297c8438d679191
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 0.9990

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://dugedepap.ru/award?keyword=ecological+succession+quiz+pdf PDF link annotation
    • https://zinurutiman.weebly.com/uploads/1/3/5/2/135295757/3124646.pdfIn PDF document text
    • http://wupidubame.mywebcommunity.org/gosuxinudowugezemamir.pdfIn PDF document text
    • https://kipewupariwigel.weebly.com/uploads/1/3/1/3/131379586/noniga-pages-muzusoxikamo-kivazaka.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/a45424c738.pdfIn PDF document text
    • https://sufixekanol.weebly.com/uploads/1/3/4/7/134712322/7082662.pdfIn PDF document text
    • http://tonalemeketav.66ghz.com/diabetic_retinopathy_guidelines_royal_college.pdfIn PDF document text
    • https://sesesisemiv.weebly.com/uploads/1/3/4/7/134746737/gepisadu.pdfIn PDF document text
    • http://tofoxewesaxizuz.mywebcommunity.org/42666863247.pdfIn PDF document text
    • https://nigupisotaku.weebly.com/uploads/1/3/4/3/134374455/56da510e351.pdfIn PDF document text
    • https://bufuxilanu.weebly.com/uploads/1/3/4/4/134402831/7662535.pdfIn PDF document text
    • https://sumejuloluguwir.weebly.com/uploads/1/3/5/3/135390827/530802.pdfIn PDF document text
    • http://pagexanomala.22web.org/poduzamonemejenazapabav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4e3f46c-a3a3-4950-9579-9200d58acd12/how_to_show_data_table_in_excel_graph.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed592e5-bd01-4120-9751-d6a08a219b77/75567117369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77267bd2-5b35-4631-a1de-30b0b885bc7e/does_ifit_have_live_rowing_classes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5929e1e-b424-4933-b532-2aedb8b13c68/47820263026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6d2c9d5-acbf-42ad-9182-70455bff83b5/zugutavaledover.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/what_is_english_second_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09416e6b-5a91-48b1-af8b-ed1e6b194f41/kawefulewoput.pdfIn PDF document text
    • http://zizajurowetomej.epizy.com/51996421402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/718183b0-2c35-429b-ae48-f310afb5d5c9/how_to_use_propresenter_remote_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c729745-cc88-4a92-b0fd-cf28d674b716/zolagetadofolejefat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53febe9e-cedd-4376-b520-bd629627d7f9/9245548687.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 5360 bytes
SHA-256: b60eadcb137464837bd4ca5c18856fad6451ae6cb55f7e16c9d2d1c364c29ef8
font_01_sfnt_off00011d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D71 12420 bytes
SHA-256: 93b0ed32b1b0e560408af7add6d4fbac91fce5f44c0a7a015e73539f3181c871
font_02_sfnt_off000145f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F4 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953