Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc82cf3369e7975…

MALICIOUS

PDF

88.7 KB Created: 2021-03-26 07:32:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 82d5ff654041d8760e401b60e020d095 SHA-1: be81a034b4753c38ac1d7d1011c26b9bed928bdd SHA-256: dbc82cf3369e79759bbc9aba0dbd141f4c206f626e68717946423f8e9f53c91a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to 'Momentum and impulse problems worksheet answers', aiming to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/123?utm_term=momentum+and+impulse+problems+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450506/normal_5fc773331411e.pdfIn PDF document text
    • http://zefakelilivaxo.iblogger.org/kotefaroto.pdfIn PDF document text
    • http://pilizepanaritob.22web.org/what_are_the_five_level_of_leadership.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481285/normal_60118ddd8fb37.pdfIn PDF document text
    • http://rivuxini.66ghz.com/smoothie_recipes_low_calorie_high_protein.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5fe6a2528fe22.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebesoxu/CbT1ghp/everfi_module_5_credit_scores_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411501/normal_60543c53cd3f8.pdfIn PDF document text
    • https://cdn.sqhk.co/tojemapimibo/Ije76hg/metformin_er_500_mg_tablet_extended_release.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kogavajel.epizy.com/fitefusinetoko.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_fca60920857945eea594815c66590e26.pdf?index=trueIn PDF document text
    • https://16dc6c2a-32e3-4a69-9eea-5b59d93654f8.filesusr.com/ugd/176c29_9b9ed52837a945478502e1bb7c5bf204.pdf?index=trueIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_729b45b00b514e19a22d495b76091ef2.pdf?index=trueIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_24e0d12b09cb484d9a9c068273b2a831.pdf?index=trueIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_51462d7cac394989a98a5f2ae52c758c.pdf?index=trueIn PDF document text
    • http://vukanaxugosazed.rf.gd/funza_lushaka_application_form_2020.pdfIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_3de76c684e1746ff97a1ac8b7a30df9e.pdf?index=trueIn PDF document text
    • http://mavugivedib.rf.gd/basal_ganglia_bleed.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_c23b241decae4b36a025100ad5058131.pdf?index=trueIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_764ba26237474cc397e85f6bacff3ed1.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 6944 bytes
SHA-256: 335657b499cc34f461bc749011cca7a348264c83169054e46b8c00635f101a61
font_01_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 5500 bytes
SHA-256: c9c2bacea148298a0a96c466d72099793c67d37787cc28edac4ca7e7c965ab29
font_02_sfnt_off00011798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 11652 bytes
SHA-256: a8a7ab662f51d4bd5e0287db4a7d5a05adc6d50d721a57f63e1474209dc23067
font_03_sfnt_off00013fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB1 16076 bytes
SHA-256: 2d74c40c36ad004230259722b174a71ae17572c9d5de481b062cd2c3b60ee6d4

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